Add variables to prevent voting of various kinds (#5361)

* Add a way to disable voting for maximum authoritarianism

* Allow disabling specific vote types via cvars

* Migrate standard-vote-to-cvar dictionary to being static

Content.Client/Voting/VoteManager.cs

@@ -186,7 +186,8 @@ namespace Content.Client.Voting
             _standardVoteTimeouts.Clear();
             foreach (var (type, time) in message.VotesUnavailable)
             {
-                _standardVoteTimeouts.Add(type, _gameTiming.RealServerToLocal(time));
+                var fixedTime = (time == TimeSpan.Zero) ? time : _gameTiming.RealServerToLocal(time);
+                _standardVoteTimeouts.Add(type, fixedTime);
             }
 
             CanCallStandardVotesChanged?.Invoke();