0b098ee2e5
Also, clean up the class hierarchy for AnimationController now that we've renamed progress to value. That means everything in the hierarchy now has a value, include Watchable. This patch renames Watchable to Animated<T>, which lets us use that type almost everywhere. I've added some ducktape to modal bottom sheets to avoid having to refactor all of Navigator to use AnimationController. I'll remove the ducktape in the next patch.
Small examples of the Flutter widget framework
To run these, open a terminal in this directory and use the following command:
flutter start --checked -t foo.dart
...where foo.dart is the file you want to run.