android: extract Dalvik VM related services to their own module

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
android: pause on lost focus too

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
android: exit application on destroy request

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