Last move highlights for rook castle #367
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Currently if the user performs a castle by dragging the king onto rook, the last move highlights will be on the king and rook's former squares. But if the user drags the king two squares, it'll be the king's former and new square.
This PR makes it so that for the standard castle (king on e1, rook in corner), the highlights are always e1/g1 or e1/c1. Also contains unrelated tiny cleanups done in other parts of the file.