Major cleanup of AgloeWorld and future-proof map.yml configs
Get rid of a lot of superflous instance fields of AgloeWorld. Use a default map.yml that copies defaults when the map loads. As long as you have a map.yml that contains some valid YAML a world should never fail to load. This means I can add more map.yml config settings in the future and Agloe will "convert" configs on map load. Wooh!