Add HUD button that displays your SSS role and allies (#1895)

* Add button that displays your SSS role and allies

* Capitalize button name

* Add cases for 0, 1 and invalid number of allies

* Make the ally syncing system saner

Content.Shared/GameObjects/ContentNetIDs.cs

@@ -71,6 +71,7 @@
         public const uint CUFFED = 1065;
         public const uint HANDCUFFS = 1066;
         public const uint BATTERY_BARREL = 1067;
+        public const uint SUSPICION_ROLE = 1068;
 
         // Net IDs for integration tests.
         public const uint PREDICTION_TEST = 10001;