BB10: Started porting BlackBerry 10 UI to Cascades.
BB10: Added few support classes.
BB10: Adapted code for upcoming Cascades UI.
BB10: Implemented Cascades based UI for BlackBerry 10.

Closes #9 - Native (Cascades) UI for BlackBerry 10.
BB10: Added About page.
BB10: Added application cover (a.k.a. Active Frame).

Displays source and translated text.
BB10: Removed `3rdparty/bb10-qt-components` submodule.