Create system for loading

[kmerfeld]

Package abilities.yaml and any other generation and theme settings in a "world" package.

An example of things that could be in here are card images, and a file containing the text a player would get when starting a tournament.

The server will create a folder named "worlds" if one doesn't exist and pull a default world package.
Different packages will be able to be selected via flag when starting the server or via config file