Added A Level Select Screen

I have tentatively titled the campaign Ganithracks Malice, mostly because it is what I came up with when I wanted to test the title bar and also because it doesn't contain a V, which I haven't implimented yet.  I only have one level Icon right now, so I just put down Earth --which has clearly been rendered in the highest of detail-- three times. 

The greyed out ones are not yet selectable as you've got to beat Earth before you can move on to Earth 2 and then you have to beat Earth 2 before you can do Earth 3.  The cool thing is you can do arbitrary dependencies which should allow for fun and varied campaigns with multiple paths.  With this additional menu, it seems much, much more like a game.

-Liam