Android homescreen shortcut

Can create homescreen shortcut for ppsspp game.
Shortcut contain path to game iso, sent to ppsspp upon start to imediately launch the game.

Should work on most launcher. I tested works on nova, stock htc sense, and launcher8.

Current limitation is shortcut can't work if ppsspp already resident in memory (because code start from onCreate, need to fix this later).

I use simple file dialog instead of ppsspp GameBrowser, I don't know how to use GameBrowser from shortcut activity.

Need to modify some /native part,  pull request will follow soon.