(BlackBerry) Add initial in-game RGUI support.

Adds the in-game RGUI after loading an initial rom. A swipe down from the top bezel will bring up the menu.

I had to change the gfx context a bit, as you can't destroy the application window when rom switching as it kicks you back to the home screen then fails to create a new window. Same goes for the context as it will destroy the window if it's destroyed.