Fix the gradle templates so that they default to values rather than throw build exceptions. (#19916)

When creating a new project, the build fails with an error similar to:

"versionCode not found. Define flutter.versionCode in the local.properties file."

This puts developers in the untenable situation of having to edit a file with local paths, but being unable to check it in.

This changes the templates to default to using versionCode 1 and version "1.0" if they are not defined in the local.properties file.

Fixes #18983.

This reverts commit e52eeba3.

* Revert "Revert flutter/flutter#19592 (#19861)"

This reverts commit 00aac68e.

* Revert "roll engine to 6f7bdc9fabef810b14577deef5cf330029fd290e (#19848)"

This reverts commit 8b056296.

It was causing problems rolling Flutter into Fuchsia

This reverts commit 0636c6fe.

Disallow calling stop() or cancel() multiple times. This means that
when you use startProgress you have to more carefully think about what
exactly is going on.

Properly cancel startProgress in non-ANSI situations, so that
back-to-back startProgress calls all render to the console.

Pull in new versions of packages with fixes for SCREAMING CAPS CONSTANTS.

* Revert "Revert "Roll engine to 7d17da76d (#19785)" (#19792)"

This reverts commit e1a3e1bf.

This reverts commit 8adecb62.

```
7d17da76d Package Skia licenses into a separate file from other third party libraries (#5861)
d2d8bf394 Pass touch events to embedded Android views with dispatchTouchEvents.
216908652 Synthesize Android MotionEvents with the long form obtain method.
0b4432769 Roll src/third_party/skia 396661825f45..1c94a8fabed7 (8 commits) (#5859)
f50e218d9 Rename clip mode to clip behavior (#5853)
42bd86d6d Make the virtual display's presentation window non focusable. (#5845)
a726e1d85 Roll src/third_party/skia c062b6be5a01..396661825f45 (3 commits) (#5857)
3fa83d2d2 Roll src/third_party/skia 15020ea2cf44..c062b6be5a01 (1 commits) (#5856)
75ad43954 Roll src/third_party/skia 4c7a750e5543..15020ea2cf44 (1 commits) (#5855)
5cd8b4530 Roll src/third_party/skia 75e5406be66a..4c7a750e5543 (2 commits) (#5854)
e12b52841 Roll src/third_party/skia b8eeb808d84f..75e5406be66a (17 commits) (#5852)
5bc1e68b6 Remove check_roll from Travis (#5846)
```

Our Cirrus Windows tests were not really working: they reported success even when failing.

This should fix several problems with the Cirrus Windows tests.

* Just commiting two files now

* Fixed one tab

* Fixed latest changes

* Changed the data structure from a map to a single radio panel object

* A few more changes

* Fixed change from expansion radio to regular list

* Fixed change from expansion radio to regular list2

* Changed the radio constructor

* Last fixes

* Final commit

* Actual final commit

* Last change

the thumbnail is not related to the link anymore 
https://github.com/flutter/flutter/issues/17380

These are bugs uncovered by the integration test for embedded Android
views:

  * Some PointerEvents were constructed with radiusMinor set to
  radiusMajor.
  * Some PointerEvents were missing radiusMajor/radiusMinor.
  * The pressure parameter was not passed to PointerUpEvent.
  * radiusMin, radiusMax, radiusMinor, and radiusMajor were not
  converted from physical pixels to logical.

Sending the fixes without a test as the bugs are covered by the integration
test that is going to land soon.

Updated documentation of SizeTransition, since I found it less than intuitive.

I added some constructor asserts to make the (existing) contract more clear.

* Skip integration tests that use flutter-tester on Windows

This is known to be broken. I will un-skip all of these once a fix for flutter-tester lands on Windows.

* Save with added import!

* Add tests to ensure flutter run does not quit at startup

These tests require https://github.com/dart-lang/vm_service_client/pull/38 to be merged and currently the third test (pause-on-exceptions) fails because of a bug.

* Remove TODO

Probably makes most sense this way for now.

* Address PR comments

* Look up breakpoints rather than relying on magic numbers

* Make breakpoint comment more obvious

Samsung Galaxy S9 is not an emulator and installation of
the release packages with 'flutter run --release' should be possible.

* Add `--dry-run` option to `flutter format` sub command

* Add `--set-exit-if-changed` option to `format` sub command

* Add `--machine` option to `format` sub command

* Make variable names to be not shorthand: cmd -> command

Fix https://github.com/flutter/flutter/pull/18360#discussion_r199656120

This reverts commit 38407199.

Bug: https://github.com/flutter/flutter/issues/19435