Changes to the menu
Keymapping menu works. Saving and setting back to default is working.
Sound on/Sound off menu item is displaying again.
Fixed a bug where clicking Back on the Options menu exited the game.
Merge branch 'GraphicalInput' of https://github.com/DComm2013Network/CutThePower into GraphicalInput

Removed the warnings for unused strings.
Set the menu item sizes to be displayed properly.

Still to do:
Change the menu to use a TrueType Font.

Conflicts:
	assets/Graphics/map/map_01/map01.txt
Merge branch 'GraphicalInput' of https://github.com/DComm2013Network/CutThePower into GraphicalInput