Loans!

Added loans to the game. Press the down arrow or S to access the loan board, where you can pick a loan. Gain money upfront, but pay it back with interest. Or you can pay it back early, so the remaining amount of money isn't paid back with interest. Made some other QoL changes, such as profit/loss text to show how much money you won or lost from the spin, clicking the bin icon will discard all bets on the board, and more I'm probably forgetting.

Update: Added the Loan Shark. He now requires you to beat enemy level 5 to prove you can repay his loans. Also updated how loans are calculated, and will now be proportional to the amount of money you have.