Change so that the app preferably installs in the device external
memory. Also change so that it runs in sensor landscape mode.
Add main menu item strings to string.xml for future
internationalization.
Rework main menu screen to concept art prototype since i wont be working
with pre-forked art style. Add code so that menu items scale with device
screen size.
Move player name and difficulty input from new_game_activity layout to
its own dialog window. This dialog will be called before the new game
activity. No code for dialog added yet.
Remove starting budget and launch carrier selection. This will be added
in the initial launch screen.