Floor, tiles, trees(kind of), and some other basics

-Adds a plane, flat on the Z axis, 1000x1000.
-Puts in an array to store the 50x50 grid of tiles.
-On start, randomly generates trees(Blue squares at the moment) all
around the center of the grid.
-Allows moving around the screen using arrow keys
-Some base code for getting what is on a tile based on your
mouseposition, and getting xy coordinates from the i,j in array.
Added tanks and some basic movement
Merge pull request #1 from Aaronneyer/master

Adds a bunch of things