lib: intro app.nit with logging methods

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: mnit_app use app.nit

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: move android.nit to a project ::android

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
android: imports app.nit

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/android: move platform declaration to a submodule

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: add log features from mnit_app::android_app to ::android

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