This reverts commit 99bc4de7.

Revert "Revert "Roll Engine from 2e5833b7c572 to 9cb4d2dd243d (32 revisions) (#73594)" (#73609)" (#73610)

This reverts commit 19b76ade.

This reverts commit 4606a69b.

Revert "Revert "Fix _LateInitializationError for RenderObjectElement.renderObject (#70974)" (#73575)" (#73580)

This reverts commit f364bcb5.

This reverts commit c243d834.

* [dev] Don't use await for on stdout and stdin; pass local engine argument

1) Don't use await for on stdout followd by await for on stderr.
   This can cause nothing to happen. E.g. if one didn't do something
   like `flutter pub upgrade` dev/automated_tests and the version in the
   old one was pre-nnbd (but flutter itself use lots of nnbd stuff) lots
   of errors would be emitted, but because we basically only listen to
   stdout nothing will happen (deadlock once stderr buffer runs out).
   Note that it still awaits the exit-code below.
2) Pass --local-engine (if given) so there won't be any crashes because
   of that.

This reverts commit d3a2db22.

This reverts commit d4c77f31.

This reverts commit 273630c0.

* Create icons golden test

* Update icons_test.dart

* Update icons_test.dart

* Update icons_test.dart

* change test name

* Add ability to load material icon font for golden tests

* formatting

* Skip test for browser

* Add end of file newline

Adds an example to the docs for ActionListener.

This reverts commit 4901744e, which was a minor breaking change that I missed.  Will try to open the PR again following the breaking change process.