* Stop using build_runner for dart2js

* fixes to yield when computing hashes and to imports

* add missing await

* Update filecache_test.dart

* Fix paths in filecache test

* use file uri for import

* add test cases and configurable override

* remove test dep

* fix filepaths for windows

* test no longer failing

* fix paths for test cases

* fix typo

* address comments

* make a constant

* make filehash async and use constant

* fix silly logic error

* add missing trailing commas

* add more missing trailing commas

* add more and more missing trailing commas

Currently Linux builds override the default BUILD mode by putting it in
the generated config. That makes it sticky for manual runs of make,
which is inconsistent with how other platforms work.

Instead, pass the build mode as a command-line override, the same way
someone would if building directly with make. This makes the flow of
controlling the mode less confusing.

Fixes #41528

* [flutter_tool] Report to analytics when the tool is killed by a signal

* Fix analyzer lint

This reverts commit 8e231796.

Adds macOS support for `flutter create`:
- Currently it is behind a hidden flag.
- Adds a TargetPlatform workaround to lib/main.dart in the standard app template when enabled.
- Supports `app` and `plugin`; `module` support doesn't yet exist for macOS in general.

This will eliminate the need to use FDE's examples as templates on macOS. The templates are based on the current state of FDE's examples, with templating support added (and with adoption of the new application delegate in the app, which hadn't been done yet in FDE, eliminating some boilerplate from the template).

Fixes #30703 

Moves the generated config into that directory. Matches the structure of
the other desktop projects.

Also fixes #40265

Moves files generated in windows/flutter/ as part of the build to an ephemeral/ subdirectory, matching the approach used on macOS (and in the future, Windows).

Adds that directory to the generated properties file to minimize hard-coding of paths in the project.

Avoids unnecessarily breaking projects that have another .xcodeproj in
their macos/ directory, which worked until the addition of the getInfo
call.

This reverts commit 202c1b42.