Initial attempt at walls.

No sides, and the perspective looks off on the front...
Draw a wall object on the grid.
Merge pull request #6 from brwyatt/master

Add GPL
Adding GPL headers
Merge pull request #9 from brwyatt/master

Adding build badges
Merge pull request #12 from brwyatt/master

Merging Diagonal Movement fix from Master
Merge pull request #14 from brwyatt/master

Merge from Master
refactor variable names to be clearer
scale height by 2/3
Scale top by adding 1/10 distance from middle (sortaish)
Rename to bottomFrontDistance
Adding better grouping and comments
Adding finding back vertices
Moving setColor closer to where it is used/needed
Right side of wall
Left side of wall
Draw the top of the wall too
Make 1/4 of spaces be WallTiles
Remove unused and pointless code fragments
Remove objects from screenObjects before removing from square