Rewrite the main config so that all config access is done through API object holders that are synched from the Configuration object.

This will fix synch issues with the config GUI.
Care must be taken to not change certain settings on a running server to prevent world gen corruption.
It may be appropriate to have some settings saved with the world and synched from the world save NBT on load, to prevent people from breaking their worlds if they change volatile settings from when the world was created.