Upgrades!!

I got upgrades working!!! For reasons you will find out in the future, I wanted to make the upgrades adapt dynamically with the purchase buttons.

I know you have no way of knowing what that means, so put simply- I have it set up so that you can change which ball corresponds to which purchase button, and I linked upgrades up to that.

Anyways, just two more steps till I release the first beta! I want to add some minimal polish and get save states working.