Change the format config files are saved as. To generate one, type `saveconfig()` in the console. Doing this has temporarily broken the settings menu further.

Corrected identification of entities in map loading.
Scoped play/stop music to the world for lack of a client.
Added a dummied client class to eventually expand into client stuffery.
Gave the world a start method that calls the start method on its active map.
Changed table.print to have a start and end line to make it easier to investigate table properties.
Killfeed updated to use the .class.name attributes instead of crazy object interpretation.
Updated middleclass to 3.0.1, I'd make it a submodule but I don't wanna refactor everything's init to be initialize.
Tweaked the startup prints to better granularize the order of things.
Pushed startup globals into variables.lua
Temporarily stubbed the selectworld and drawui methods due to referring to older variables.