* 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.
Resolves an issue with sanitize_hexcolor where it'd return an incomplete string such as ""

Resolves an issue where whitespace in names could cause a saveslot button to wrap to the next line.

Byond members:
can colour their name using the admin ooc-colour feature.
get a icon next to their name in ooc chat.
can choose their icon_state as a ghost.
get 8 saveslots

unlock_content tracks the return of IsByondMember(). This is to allow for easier testing/debug.
Merge pull request #762 from Giacomand/DoubleAgents

Double Agent Gamemode
Merge pull request #789 from Carn/member_content

Resolves an issue with sanitize_hexcolor where it'd return an incomplete...