New types for cell and pixel coordinate position/vectors.

OpenRA.Mods.RA/TargetableBuilding.cs

@@ -31,7 +31,7 @@ namespace OpenRA.Mods.RA
 		public string[] TargetTypes { get { return info.TargetTypes; } }
 		public bool TargetableBy(Actor self, Actor byActor) { return true; }
 
-		public IEnumerable<int2> TargetableCells( Actor self )
+		public IEnumerable<CPos> TargetableCells( Actor self )
 		{
 			return self.Trait<Building>().OccupiedCells().Select(c => c.First);
 		}