This all happened because I was trying to be a little too helpful...

Part of the job of the "create" command is to recreate missing pieces of existing projects, and now that the default has changed, I wanted to make it so that if someone had created a default flutter create project before, that they could run a default flutter create there again, and not have it trashed by using the new default template (application) over the old one (app).

This meant I had to detect what type of project it was. Unfortunately, in the past we didn't write anything in the .metadata file to identify the type of project, and since the goal was regenerating missing files, I can't count on anything existing, so it's just a heuristic match.

This simplifies the heuristics down to just detecting the difference between "app" and "application" projects, and only detect the other types if they're explicitly listed in the .metadata file (I changed the code in my original PR to add the project type to the .metadata file). People used to have to specify the type for those anyhow, so it shouldn't be a surprise to users.

So, the main difference in the new heuristics from my last attempt is that if you have a directory that has some other stuff it (like maybe a "plugin" project), then we'll recreate (pronounced "mess up") the project using the "application" template, but that was true before (except it would use the "app" template).

Fixes #22726

This reverts commit 3c56e6c7.

It breaks the AOT build.

* first pass

* revert WidgetsBindingObserver

* disable prefer_mixin

* docs and more mixins

* newer engine; binding fixes

* upgrade dependencies

* fix test binding

* remove whitespace

* remove the obsolete `enableSuperMixins: true`

* upgrade dartdoc to 0.22.0

* temporarily use git version of dartdoc

* fix pub global activate syntax

* use dartdoc 0.23.0

https://github.com/flutter/engine/compare/4eaf9ef4271a...572fa5646af7

git log 4eaf9ef4271a..572fa5646af7 --no-merges --oneline
572fa5646 Roll src/third_party/skia 032f2756df64..51c89e41c05b (16 commits) (flutter/engine#6453)


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* updated comment

* [Documentation] Moved lerp macro def to painting/

https://github.com/flutter/engine/compare/90b1023c84c4...4eaf9ef4271a

git log 90b1023c84c4..4eaf9ef4271a --no-merges --oneline
4eaf9ef42 Roll src/third_party/skia a6262495da48..032f2756df64 (2 commits) (flutter/engine#6450)
c5e52dc31 Roll src/third_party/skia 92d10833de63..a6262495da48 (1 commits) (flutter/engine#6449)
efb24f12b Roll src/third_party/skia 4f87e2255b8a..92d10833de63 (2 commits) (flutter/engine#6448)
28e513613 Roll src/third_party/skia d945698c5dfa..4f87e2255b8a (2 commits) (flutter/engine#6446)
a2ea59f2c Roll src/third_party/skia 4302eb9a6e14..d945698c5dfa (4 commits) (flutter/engine#6445)


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* [frdp] Add optional dart isolate filter.

It's now default to filter out non-flutter isolates when searching
across Dart VM's.  This is due to a possible issue wherein an Isolate
for testing might have the same name as the flutter Isolate.

In addition, logging messages have been added in dart_vm.dart for
debugging.

https://github.com/flutter/flutter/issues/22338#issuecomment-425794734 shows almost 1 minute being spent on the `Resolving Dependencies` step alone. Possibly this needs to go higher still, but this should be a good start.

https://github.com/flutter/engine/compare/cf0855e69fa8...90b1023c84c4

git log cf0855e69fa8..90b1023c84c4 --no-merges --oneline
90b1023c8 Remove unused imports and variables (flutter/engine#6437)
1f98aa6df Add the isolate name server to the set of native APIs available on secondary isolates (flutter/engine#6444)


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https://github.com/flutter/engine/compare/45c5fe5613cb...cf0855e69fa8

git log 45c5fe5613cb..cf0855e69fa8 --no-merges --oneline
cf0855e69 Roll Dart to version  c6254163dc7a5f704d7609af65e4650ef0550ccd (flutter/engine#6439)
2fa1ab9de Roll src/third_party/skia d95303e10cbc..4302eb9a6e14 (12 commits) (flutter/engine#6443)


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This reverts commit fef759f4, because apparently
the service is still "unavailable".

https://github.com/flutter/engine/compare/c8755d74c17e...45c5fe5613cb

git log c8755d74c17e..45c5fe5613cb --no-merges --oneline
45c5fe561 Remove touch mapper and respect the UITouch phase when calculating the pointer data change type. (flutter/engine#6430)
234736801 Roll src/third_party/skia 66a973493468..d95303e10cbc (13 commits) (flutter/engine#6440)


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This reverts commit 9eca0830 to turn on
docs generation again, since now we have paid...

The Gallery deployment was missing some secrets in order to correctly deploy. This adds those missing secrets as encrypted env vars.

Apparently, this accounts for 13% of our crashes in Beta.

I missed some create template conversions in the devicelab directory.

Fixes the build after my module rename broke the Windows tests.

This renames the "module" template to the "application" template, and makes "application" the default. The existing "app" template is now deprecated.

flutter create also now recognizes the type of project in an existing directory, and is able to recreate it without having the template type explicitly specified (although you can still do that). It does this now by first looking in the .metadata file for the new project_type field, and if it doesn't find that, then it looks at the directory structure. Also, the .metadata file is now overwritten even on an existing directory so that 1) the project_type can be added to legacy projects, and 2) the version of Flutter that updated the project last is updated.

I also cleaned up a bunch of things in create_test.dart, added many more tests, and added an example test to the test/ directory in the generated output of the application template.

Fixes #22530
Fixes #22344

https://github.com/flutter/engine/compare/74e68ff8b108...c8755d74c17e

git log 74e68ff8b108..c8755d74c17e --no-merges --oneline
c8755d74c Update FlutterFrontendCompiler.rejectLastDelta to match the signature in CompilerInterface (flutter/engine#6426)


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git log 7e3b41dc7ba6..74e68ff8b108 --no-merges --oneline
74e68ff8b Roll src/third_party/skia 7b7805581733..66a973493468 (4 commits) (#6436)
58fbd1fd1 Roll src/third_party/skia 4442e3138927..7b7805581733 (1 commits) (#6435)
83151d9fc Roll src/third_party/skia 4dd17156c6e4..4442e3138927 (1 commits) (#6434)
5fe7e377d Roll src/third_party/skia 8841085abeb9..4dd17156c6e4 (1 commits) (#6432)
5340f4224 Revert "Use single_root_scheme when compiling platform (#6402)" (#6431)
37fd43d43 Add deadline_now_delta argument to Engine::NotifyIdle's trace (#6419)
4af077b29 Roll src/third_party/skia 4504a652c071..8841085abeb9 (1 commits) (#6429)
165f3dd1c Update //third_party/benchmark dependency to 21f1eb (ToT). (#6427)
34bd0ef87 Don’t build benchmarking binaries on Windows. (#6428)
ae4db4469 Ensure setViewIdResourceName has the correct version guard (#6404)
2c5d0c407 [rapidjson] Fix import statements (#6418)
c2128fc80 Create a benchmarking target for the shell. (#6420)
30f78af91 Raise errors on non-zero exits while creating artifacts on the bots. (#6424)
191168cec Disable line_height tests on Windows (#6423)
061cc6643 Fix ideographic baseline to match spec. (#6422)
74eac1f56 Roll src/third_party/skia bfa76f20bfcf..4504a652c071 (14 commits) (#6421)
10b45405b Implement ParagraphStyle.line_height and add tests for line_height and baselines. (#6417)

* Vertical divider bug fix and additional cleaning.

* added sample code for scaffold widget [#21136]

* Fixed indent and spacing for scaffold sample code

* Update scaffold.dart

Fix one more formatting issue

Previously flutter_tools had used "gradle properties" to find the build types
and flavors supported by the Gradle project.  Tasks should work more reliably
across different versions of the Android Gradle plugin.

Fixes https://github.com/flutter/flutter/issues/20781

* Adding Changelog URL to the README.md file

* Update README to match the latest version on DEV

- Update README to match the latest version on DEV branch 
- Add Changelog URL

* Update README.md

Fix contributing link

This reverts commit ec0df111.

https://github.com/flutter/engine/compare/74662ab69523...7e3b41dc7ba6

git log 74662ab69523..7e3b41dc7ba6 --no-merges --oneline
7e3b41dc7 Roll src/third_party/skia 08417bccf256..bfa76f20bfcf (4 commits) (flutter/engine#6416)
69ae5694d Do not register UI-related native functions in secondary isolates (flutter/engine#6401)
19c135c67 Roll src/third_party/skia b627af80e3a4..08417bccf256 (8 commits) (flutter/engine#6415)
65b886ba9 Roll src/third_party/skia be8193c9313a..b627af80e3a4 (1 commits) (flutter/engine#6414)
360d44668 Use single_root_scheme when compiling platform (flutter/engine#6402)
c7a5abf98 Roll src/third_party/skia deb512045e6a..be8193c9313a (1 commits) (flutter/engine#6413)

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* Revert "Custom offset functionality for Popup Menu Button (#22534)"

This reverts commit f44b277f.

* Revert "Updated the ColorScheme dartdoc: a11y (#22618)"

This reverts commit aa6a27e8.

* Revert "Added support for the Khmer (km) language (#22617)"

This reverts commit 3a87b93f.

* Revert "Use 'Future<void>' insted of 'Future<Null>' in SystemChrome (#22583)"

This reverts commit 37c10acb.

* Revert "Choice Chip Fix (#22589)"

This reverts commit 8d76d37f.

* Revert "Throw if trying to set fs.currentDirectory in tests (#22037)"

This reverts commit 2f6155bf.

* Revert "Use (processors-1) for test runs (test defaults to processors/2) (#22085)"

This reverts commit d44f0030.