Merge: Intro of app.nit and extract features from mnit_android to android

Rename modules and reorganize their features.

Pull-Request: #467
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Chanoir <chanoir.romain@courrier.uqam.ca>
Reviewed-by: Jean Privat <jean@pryen.org>

diff --cc lib/mnit_android/android_app.nit
Simple merge