- Level Editor (continued...)
    - fixed bug: Editor.mouseDownDeleteLayer was not being set when a tile was deleted which meant deleting while dragging the mouse was deleting from all layers, not just from the initial mouse down layer
- a lot of simplification of map data, map loading code, and Car hole detection code
    - removed 'Solid_Sides' and 'Ground_Sides' levels from maps
    - introduced Ground component which has collision setup
    - all ground related components now require Ground
    - Car now detects if its off the edge by checking if it is not hitting Ground every frame, which removes the need for Hole component and Collision Markers in the map
    - decreased the size of the collision polygons for the Car so that they are small enough to not touch the ground when driving over a single tile gap in the ground
    - loading level code has been simplified, since it does not need to set collision for ground components any more
    - cleaned up unnecessary BreakingGround code
- Level Editor (continued...)
    - now when adding tiles, also adding correct component to the new entity in preparation for game play
    - can start playing the edited level by hitting the 'P' key (Note: still a WIP, as editor is not disabled correctly when playing the level)
- combined all ground and solid block images into a single image
- combined all object images into a single image (tiles2.png)