Merge: Intent: An android API to launch activities and services

New API for `lib/android` allowing to start/stop activities and services. Intent tests raised new subtle errors in `Bundle`API and `Audio` API that have been fixed in this PR.

Pull-Request: #644
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Jean Privat <jean@pryen.org>