Bugfixes for Exchange Objectives

-Will no longer be assigned to latejoiners
-Objective description will report the other agent's real_name
-Objective description will report what job the other agent is
-Objective description will properly rename itself if the other agent is renamed (e.g. clowns, mimes)
-Explanation text made more noticeable
-Cleaned up the code a bit
Bugfixes for Exchange Objectives

-Will no longer be assigned to latejoiners
-Objective description will report the other agent's real_name
-Objective description will report what job the other agent is
-Objective description will properly rename itself if the other agent is renamed (e.g. clowns, mimes)
-Explanation text made more noticeable
-Cleaned up the code a bit
Resolved Conflicts:
	code/game/gamemodes/traitor/traitor.dm
Update Ready
Removed spawn()
Resolved Conflicts:
	code/game/gamemodes/traitor/traitor.dm
Update traitor.dm
Merge pull request #3931 from Ikarrus/exchangeupdate

Bugfixes for Exchange Objectives