Dark Forest Token Market

A plugin which allows darkforest players to sell their artifacts to each other in game.
The contract should be able to get reused over multiple rounds
depends on Dark Forest.

TODO (help appreciated)

• Make the smart contract better (I think its fine now but if there are any problems I WILL redploy it)
• Make sure MANY tokens can display at once in UI (need someone with lots of artifacts to help test this)
• Better docs / comments