Added stats database and moved global constants

Global constants will appear on the next commit, in the functions
library. The global variables file is now a bit cleaner, with
unnecessary MAXIS references removed.
Added global variables, and removed "gathering stats" piece

Not all counties will use this one, and I can always add it back in
later. Only removed for now to keep this in sync with how it's working
in MAXIS. Can always revisit.
Added "developer mode", which will access the master branch

Added myself (in all three of my iterations) as well as @paschell and
@RCSchultz. Will consider adding @RobertFewins-Kalb or @CDPotter if they
request to do so.