Gang Mode for TG

# Adds the first iteration of Gang Mode for TG
- 2 or 4 players will be selected to be the bosses of two different gangs.
- They will be able to convert via flashing
- Gangsters (converted crewmembers) will only be able to see the icon of their bosses
  - Gang bosses will be able to see icons for everyone in their gang
- Gang bosses are supplied with a shuttle recaller that can recall the shuttle from anywhere on-station
  - Recallers still need to be used before the point of no return
  - Recallers will send a tracable signal, and communications consoles can know where they come from
  - Recallers can only be used by Gang Bosses
- Gangsters can be reformed (de-converted) by striking them at their head a good few times

### Round-Ending Conditions:
- Gang Victory: The opposing gang's bosses are all dead/off-station/non-human
- Station Victory: The station is successfully evacuated

### Differences from Rev:
- Symmetrical opposing sides (Rev vs Rev, rather than Rev vs Security)
- Heads can be converted (But cannot start as a gang boss)
- Loyalty implants block conversions, but will not de-convert those who are already gangsters
- Not always knowing who is with which gang
  - Lack of membership visibility encourages gangs to stick together and work as a group to avoid friendly fire
- Evacuation as a possible round-ending condition

This has been tested on a locally hosted server of 10 players and it's been found to be bug-free (as far as we could tell).

***NOTE: I ask that admins please DO NOT add this to rotation yet, and DO NOT run it unless I am online to observe the events. The game mode has yet to be fully playtested live, and carries with it a very high risk of it being boring/stupid/buggy as shit. 
I intend to iterate on this at a relatively rapid pace until I'm confident enough to have it in rotation. What I have here is just the game mode in its most basic form. Content will be added/changed in the future if necessary.***

Oh, I also included some bugfixes and other improvements to revolution code.
I also fixed the bug where revheads would sometimes have the regular rev icon instead of their blue one.
It'd be cool if there were other names for the second part too so it could be like "Blue Snakes" instead of just "Blue Gang".
Even if you're not going to do this you should totally add "Tunnel" to this list :V