Implemented: Stances

Added: Basic stances (Aggressive, Guard (Hold Ground), Hold Fire, None (dummy), Return Fire)
Added: WorldCommandWidget (to be able to set said stances)
Added: WorldCommandWidget to ra (cnc will follow, later on)
Changed: Added support to AttackBase for firing with movement disabled + utility method ScanForTarget (used by stances)
Added: AssignUnitStance (attach this to unit-producing actors, together with what stances can be picked as 'default')

OpenRA.Mods.RA/UnitStances/AssignUnitStance.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.UnitStances
+{
+	public class AssignUnitStanceInfo : TraitInfo<AssignUnitStance>
+	{
+		
+	}
+
+	public class AssignUnitStance : INotifyProduction
+	{
+		public void UnitProduced(Actor self, Actor other, int2 exit)
+		{
+			var stance = UnitStance.GetActive(self);
+			if (stance == null)
+				return;
+
+			var target = other.TraitsImplementing<UnitStance>().Where(t => t.GetType() == stance.GetType()).FirstOrDefault();
+			if (target == null)
+				return;
+
+			target.Activate(other);
+		}
+	}
+}