Overhaul target line rendering:

- Targets are now defined by the activities
- Queued activities are shown
- Support custom attack colors

OpenRA.Mods.Common/Activities/Move/Drag.cs

@@ -12,6 +12,7 @@
 using System.Collections.Generic;
 using OpenRA.Activities;
 using OpenRA.Mods.Common.Traits;
+using OpenRA.Primitives;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Activities
@@ -62,5 +63,10 @@ namespace OpenRA.Mods.Common.Activities
 		{
 			yield return Target.FromPos(end);
 		}
+
+		public override IEnumerable<TargetLineNode> TargetLineNodes(Actor self)
+		{
+			yield return new TargetLineNode(Target.FromPos(end), Color.Green);
+		}
 	}
 }