Add logic to disallowing On Hold on a queue.

OpenRA.Mods.Common/Traits/Player/ProductionQueue.cs

@@ -35,6 +35,9 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Should the prerequisite remain enabled if the owner changes?")]
 		public readonly bool Sticky = true;
 
+		[Desc("Should right clicking on the icon instantly cancel the production instead of putting it on hold?")]
+		public readonly bool DisallowPaused = false;
+
 		[Desc("This percentage value is multiplied with actor cost to translate into build time (lower means faster).")]
 		public readonly int BuildDurationModifier = 100;