Added functional rolodex behavior

Visually, this is pretty much the proof-of-concept I'm aiming for. The
code would probably need a lot of changes to get game-like qualities
implemented however.
- The tilemap now smoothly wraps giving a rolodex-like visual.
- tileSheet.bmp was altered completely
- tile class now has lerp functionality for smooth transitions
- arrow keys allow the user to move along the tile map.