Track Auto-Rotation

Horizontal track pieces and corner pieces now automatically rotate when placed adjacent to other horizontal/corner piece tracks. If a corner track is placed adjacent to a single horizontal track, it will rotate to favor a right-hand turn, such that one click from the Hammer in Rotate Mode will make it a left-hand turn. If a corner piece is placed adjacent to two horizontal pieces at a 90 degree angle, it will rotate to the appropriate  direction for the adjacent tracks.