Small QOL update!

I’ve pushed a new small update with a few QOL features:

• You can now undo (CTRL+Z or with a button) your last placed tile, so no more placing tiles accidentally in the wrong places (well, that can still happen, but now you can undo it!)
• You can now press shift while placing to keep placing the same tile.
• There’s icons that indicate what ‘adjacent’ and ‘surrounding’ means.
• New world being infinitely spammable is now fixed.