Sprint #17 - 12/7 to 12/21

I've been spending a lot of my dev time this sprint trying to figure out where to put the palette and how to access it, and I haven't come up with a great solution. I think I'll drop the option to override specific blocks and just use the autotiles. It'll make the palette much, much smaller, so it'll be easier to fit in somewhere. 

The only real code I added was a start on placing the tiles. You can do that with the keyboard or mouse, but you can't switch which tile you place.

Anyway, this is holiday season (starting last sprint really), so I'm probably not going to get much more done before the new year, but I'll try and at least keep posting these updates, even if they're mostly empty.