Adds new service channel (:d), brings back colored channels

- Added new service channel for the bartender, chef and botanists
- Added new service headset and service encryption key
- Made all three jobs start with said headset
- Cleaned up unneeded leftovers from old mining and QM channels,
including commented parts
- All the department channels now use their custom color in the
stylesheet instead of a common one

Service channel is light blue, frequency 134.9.
Merge branch 'Bleeding-Edge' of https://github.com/Duny-/vgstation13 into Duns_service
Map modifications to integrate service channel

- Added server for the service channel
- Moved the blackbox recorder to telecomms to preserve symmetry and
because it should be there in the first place
- Added spare service headsets, 1 in bar, 1 in kitchen backroom and 3 in
the botany closets
Updates changelog
Adds service channel to Captain and HoP headsets

Enabled by default for HoP, disabled by default for Cap.
Merge pull request #961 from Duny-/Duns_service

Adds new service channel and brings back colored radio channels