This causes a BIT of visible shuffling, but is pretty nice for
a few lines of css

The big button shrinks a bit when clicked. This could make the
cursor fall off of it when clicking near the edge. I will probably
fix this later by handling the resulting mouseup no matter where it is.

Upgrade colors now start from gray, not black.

Upgrades are now unlocked at 1, 25, 50, 75, and 100 buildings.

Stats can track a variety of things about the game, and are stored in the save.
The options menu lets you reconfigure things like your name and species.