Streamlined the messagehandler functions
Changed the callback help/usage paradigm to use something that may actually work (I don't know whether it does)
Rationalized the way that configuration files are located and loaded, guarded against TOCTOU
Moved bot token to configuration file, which must be supplied manually before Priestess is first run.
Added Preferences to configuration file search path.
Added command "is minecraft running".
Removed Herobrine.