v.1.3.2 — Scaled Space-Penny Prices on Upgrades

Realistically, I should probably also put a cap on how high each item can be upgraded. (In some cases, having an item too high can make the game impossible to play.)

The major change here is that upgrades on a ship are now leveled, and the price for upgrading it again varies based on how high it's going to go. For the moment, there's a 500¢ difference per level.

Next up is likely star mass; I'm not fond of how easily you can get trapped in a gravity well on level zero. It should be lighter; players need a fighting chance!