Update engine.version

update tests for TextStyle changes in engine (flutter#17982)

* update tests for TextStyle changes in engine

* roll engine, support Foreground on TextStyle

* Support for saving Dart compilation trace on device

(WIP) Expose foreground in framework TextStyle

use identical instead of ==

Add @istest annotation to testGesture (flutter#18311)

Notifies IDEs this is a test method, and helps e.g. the flutter plugin
recognize test methods and display them in the structure view in intellij.

Update gallery assets version with optipng (flutter#18327)

Passing any to named params require the name of the parameter itself. (flutter#18361)

Update typedef syntax to use Function notation and turn on lint for old notation. (flutter#18362)

Now that Dart 1 is turned off, reapplying my change to turn on the prefer_generic_function_type_aliases analysis option, and fix all the typedefs to Dart 2 preferred syntax.

Also eliminated the unused analysis_options_repo.yaml file and turned on public_member_api_docs in analysys_options.yaml.

No logic changes, just changing the typedef syntax for all typedefs, and updating analysis options.

More flexible timeout logic in flutter_test (flutter#18256)

This should reduce the number of flakes without actually increasing
the timeout, so we'll still find out quickly if a test is hanging.

The numbers here might need tweaking. Maybe the default two seconds is
too short for CI bots.

merge/apply/lerp prefer foreground

doc updates and update for copyWith