Moved some things around!

All radios now have a keyslot var (replacing keyslot1 for headsets).
- recalculateChannels() proc moved to radios instead of just headsets.
- Removed the duplicated recalc proc for borg radios.
- Moved the translate vars to radios as well.
- The syndicate headset subtype has been removed in favor of using the
make_syndie() proc on it instead.