28709 improve error messages on Text constructors (cla: yes, framework)

28734 Update README.md (cla: yes)

28735 [Material] Create a FloatingActionButton ThemeData and honor it within the FloatingActionButton (cla: yes, f: material design, framework)

28736 Avoid the overhead of instantiating a generator in paintImage (cla: yes, framework)

28746 Remove timeout from add2app test for iOS (a: tests, cla: yes, team, ⌺‬ platform-ios)

28747 Part 1: Improve Overlay API (cla: yes, framework)

28748 Revert “Remove the old HaTS implementation on API docs” (cla: yes, d: api docs, team)