* Double Agent gamemode. Double agents are given a target to kill, which will be another double agent. All double agents are hunting and being hunted by another double agent.
 * Updated required players, enemies and restricted jobs.
Merge branch 'master' of https://github.com/tgstation/-tg-station into GameJam_DoubleAgents
 * Added double agents to config. It can now be picked by secrets/random.
 * Disabled late join antags for the double agents gamemode.
Merge pull request #762 from Giacomand/DoubleAgents

Double Agent Gamemode