Update - Edit Mode and Additional changes

Edit mode received a couple of updates. There can be multiple pages for
the edit menu now, the edit cursor highlights the selected square,
additional tile graphics were added.
- Mouse click to select tile images in edit menu.
- Left and Right Bracket keys flip pages of the edit menu
- focal position updates (beware, the changes are incompatible with
layerSpacing variable changes... could be bad)
- pressing 1 or 2 alters the game map's z variable now rather than
layerSpacing.
- Added a bunch of new tile images
- Player Tile animation blocks now shrink according to tile width/height