Physics is hard!

Multiple players informed me they'd got unexpected game losses triggered by object collisions in the air after a physics pop had sent their gameboard flying. I knew this was possible, but didn't expect it to be so frequent a problem!

The game now should handle this correctly. A food item that collides before ever entering the board will still trigger a game over (unless it immediately combines). To handle strange outcomes from physics pops, any object which settles out of the play area will also cause a game over. This is not likely to happen, but I'm sure someone will manage it.

I also redrew the mug to a quality I'm more happy with, but I suspect I'll change it to have a brighter colour in future!