Traitor (#2566)

* basic implementation

* minor fixes

* objectives temp commit

* proper onstart bind

* changes all conditions to be bound to a mind-instance

* oops

* oops v2

* adds possiblity to enable duplicate assignment of objective
equal objectives are unable to be added

* minor fixes, adds greentext

* refactors incompatability to be defined by requirements

* fixes a wrong whitespace

* minor fix

* addressed reviews v1

* address reviews v2

Co-authored-by: Exp <theexp111@gmail.com>

* final sweep

* adds/refactors traitor&sss cvars

* Update Content.Server/Mobs/Mind.cs

* never trust github web

* adds datasets & makes codewords use them

* addresses exp's reviews

* addressed zumos reviews

Co-authored-by: Paul <ritter.paul1+git@googlemail.com>
Co-authored-by: Exp <theexp111@gmail.com>

Content.Server/GameTicking/GamePreset.cs

@@ -15,5 +15,9 @@ namespace Content.Server.GameTicking
         public virtual string Description => "Secret!";
         public virtual bool DisallowLateJoin => false;
         public Dictionary<NetUserId, HumanoidCharacterProfile> readyProfiles;
+
+        public virtual void OnGameStarted() { }
+
+        public virtual string GetRoundEndDescription() => "";
     }
 }