android: intro annotation to customize Android manifest

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
android: use the metadata to customize the generated Android project

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
android: use custom manifest lines

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
examples/mnit_simple: use android project annotations

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
examples/mnit_simple: use vibration and android_manifest annotation

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>