Phase 2 of my master plan:
-Adds a Service headset channel, given to the botanists, barman, and chef. The HoP also gets the service channel on his headset.

Note: The Service Preset Server will have to be added to Telecomms on the map before the channel is usable. I'll put up the map when/if this gets merged.
Merge branch 'master' of https://github.com/tgstation/-tg-station into Master
-Changes the channel hotkey from Q to V
-Updates the headset descriptions.
-Updates DJ station infosheet.
-Adds service headsets to barman/botanist closets (chef doesn't get one for now since he doesn't have a closet, all his spare stuff is just placed in a crate)
Merge pull request #582 from Cheridan/radios

Phase 2 of my master plan: