Properly account for disabled Armaments in various places

These places didn't care if an Armament was disabled, which could lead to unexpected behavior.

OpenRA.Mods.Common/Traits/Attack/AttackGarrisoned.cs

@@ -151,6 +151,9 @@ namespace OpenRA.Mods.Common.Traits
 
 			foreach (var a in Armaments)
 			{
+				if (a.IsTraitDisabled)
+					continue;
+
 				var port = SelectFirePort(self, targetYaw);
 				if (port == null)
 					return;