* Improved defaults for scroll view primary-ness

* Vertical scroll views default to primary:true.
* Horizontal scroll views default to primary:false.
* If a scroll view is primary and it got a non-null inherited primary
  scroll controller, it introduces a primary scroll controller inherited
  with a value of null for its descendants.

ScrollController now multiplexes writes to all registered positions;
reads of position continue to assert that only one position is
registered. Reads still require a single position.

* Add cupertino to gallery and add CupertinoButto

* Use single quotes

* Add disabled state

* Some review notes

* Make button animation more responsive and tweak timing

* Renamed things Cupertino

* Button with background, move cupertino demos, move material demos

* Move 2 level list too

* Refactor various demo route names

* Some review notes

* More reviews and add test

* Linter as

* Move private constant up

This got missed in the last sweep due to concurrent PRs

This one comes with sweet Unicode support for Windows!

Ensure that read and write operations fail on ScrollControllers
associated with a number of positions other than 1.

Using these physics avoids a problem whereby the scroll view isn't scrollable
due to lack of content and therefore cannot trigger the refresh indicator.

Fixes #8432

This widget is useful on its own. This patch factors it out of AppBar so
folks can use it separately.

Fixes #8489

* [devFS] Use URI to represent paths on device

Previosuly, regular file paths in the format of the host platform were used to represent paths on device. That works when host and device share the same (POSIX) file path format. With a Windows host, this breaks. URIs are the solution as they are platform independent and the VM service on the device already interpreted the file paths as URIs anyways.

* review comments

* switch to file paths

* fix tests on Windows

* review comments

This TODO was fixed by the transition to `Finder` objects.

This ensures that both timer/microtask queues are cleared out rather
than assuming that all work is completed in a specified amount of time.

New concepts: PlatformMessageChannel (basic message send/receive superseding some existing  PlatformMessages methods), PlatformMethodChannel (method invocation and event streams), pluggable codecs for messages and method calls: unencoded binary, string, json, and 'standard' flutter binary encoding.

Instead, actually exit the tool.

Fixes #8363.

This is apperently breaking some customers.

If this gets submitted, we should investigate why self-package imports
don't work for certain customers.

* Revert "Revert "Simplify path handling logic in dependency checker and devFS (#8414)" (#8467)"

This reverts commit 96ba7f76.

* Intentionally use a self-package URI in flutter_gallery

* tests to catch problems with self-package imports

* avoid // ignore: prefer_const_constructors

* address review comments

It's common to have a ChangeNotifier that wraps a single value. This class
makes that easy by providing a generic implementation.

This reverts commit e7bde11c.

Reason: broke hot reload when using "package:" style imports for sources
within the same project.

* Add solution to gradle-dir doctor warning

* Review feedback + properly format strings

Fixes #8395.

* fix a doctor check for webstorm

* fix a missing reference

Also a small formatting fix.

This adds support for a `--bug-report` flag, which is a recording
that:
  - includes the arguments that were passed to the command runner
  - is zipped up for easy attachment in Guthub issues

* Gracefully ignore html content

* Test for less than, consolidate table tests

* Specify missing type annotation

* Add Mike Hoolehan to AUTHORS

* Simplify path handling logic in dependency checker and devFS

Simplification will make it easier to port this to Windows.

* Roll Engine to 0a7b177c330367904597a6129b3eb653d29dfca0