* s/sky/flutter/ in Android templates

* update engine.version with a compatible engine version

* replace more SkyActivity references with FlutterActivity

This is needed to update an app's layout when a soft keyboard is shown

* making flutter run work with gradle

* locate android studio

* add test for settings

* review comments

Instead, require an AndroidManifest.xml and always build an APK.

Fixes #2517

This allows us to adjust exactly which gestures we're listening for
during layout, which I'll use to kill a SizeObserver.

@abarth @hixie

Very simple so far. This schedules an alarm to fire once a day, kicking
off a service that downloads a new app.skyx from a hardcoded URL. The
new skyx replaces the current one.

@abarth

@abarth

@abarth

This is just one of many steps in preparation for turning
fitness into a play-store ready app.

@abarth @collinjackson