Better Map Generation and Faster Execution

Dare I say we have a usable map?

Huge thanks to help from the GBDK-2020 Discord server! The game runs much faster now and the biggest challenge (so far 😉), the map generation, is completed.

Next item on the to-do list is item placement.

That might come alongside item pickup but that's a different beast entirely.

• it requires keeping track of what items have been collected (to not show them again)
• im thinking of simply storing x×y for items picked up at (x, y) and just accept a limited number of items in the game