added: workshopupdatehandler

This extension monitors the Steam Workshop for updates to mods actively
running on the server. When an update is found, it either notifies
players that no one new can connect or, in the case of an empty server,
immediately cycles the map.
workshopupdatehandler: Timers, forced mapchange
Merge pull request #241 from lancehilliard/develop

added: workshopupdatehandler