Write the example config, including every current config option for every module

We will need to keep this file up to date every time we add a config option or change a default.

I wrote this specifically because Ashton wanted to play around with the server but there was no docs on the config options.
I'm ambivalent because I was planning to organize the example config differently, but we don't have enough of the modules for that done yet, and this is fine for Desert Bus (except for the madness levels which I'll fix, and other comments that I made for accuracy of the documentation).