yet another grid cannon

Implementation of Tom Francis's grid cannon.  This uses the new rules. I found that most of the grid cannon implementations out there uses the older rules.

Cards from https://greebles.itch.io/pixel-plebes 

Not the best choice of cards since the game uses color, but it's cute.

The game isn't complete in that nothing happens when you win or lose, you'll need to close and reopen the game. There might be some very rare softlocks too.

I started a long time ago to play with concatenative programming, and decided to mess around with 8th. But never got around to finishing it. I thought it was finished enough release for free.