Complete Overhaul!
- re-wrote entire grouping system allowing multiple, similtaneous tour groups!
- added config setting to cap number of tour groups
- '/tour' displays more useful information when tours are and aren't running
- added 'debug' argument for admins (prints raw group and list data)
- added 'info' argument for admins (prints settings of config file)

- Formatting + (maybe) colour-scheming todo.