The callback given to `AndroidApp::input_events()` is now expected to return
`InputStatus::Handled` or `InputStatus::Unhandled`.
When running with NativeActivity then if we know an input event hasn't been
handled we can notify the InputQueue which may result in fallback
handling.
Although the status is currently ignored with the GameActivity backend.
Since this is a breaking change that also affects the current Winit
backend this updates the winit based examples to stick with the 0.3
release of android-activity for now.
Fixes: #31
Based on the android example that's in the cpal repo, this test plays
a 440hz sine wave and is based on GameActivity
Note: this requires a workaround branch for cpal that comments out
a dev-dependency on ndk-glue that cpal has for its android example.
This is needed because Cargo is spuriously propagating this dev
dependency outside of the cpal package (which leads to a crash)