Changed getXTile() and getYTile() returns, and returned highlight graphic.
The tile highlight has returned. I did this because I enjoyed having a visual for which tile I am to manipulate. Also, the old form of getXTile() and getYTile() return values with origins have returned. Previously, stepping beyond bounds resulting in a half tile offset, which caused the tile to be manipulated to be offset by one whole tile. That issue has been corrected by returning -1 for any values below zero.