wip: Viewport sync
Animator: wip animation event
ViewController: clamp tilt in setPosition
android: refactor MapView

- merge AndroidMap + GLView into Mapview
- let MapView directly extends GLSurfaceView
android: deprecate MapActivity, add MapPreferences
update android-start example
- remove MapActivity,see vtm-android-start for an
example use of MapView
android-example: use appcompat actionbar
fixup: gradle cleanups