Add IMove.MoveOntoTarget interface

In `TraitsInterfaces` we expose offset as WPos instead of CPos. In an upcoming PR we'll translate the same change to yaml.

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

@@ -0,0 +1,43 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Activities
+{
+	public class MoveOntoAndTurn : MoveOnto
+	{
+		readonly WAngle? desiredFacing;
+
+		public MoveOntoAndTurn(Actor self, in Target target, in WVec offset, WAngle? desiredFacing, Color? targetLineColor = null)
+			: base(self, target, offset, null, targetLineColor)
+		{
+			this.desiredFacing = desiredFacing;
+		}
+
+		public override bool Tick(Actor self)
+		{
+			if (base.Tick(self))
+			{
+				if (!IsCanceling && desiredFacing.HasValue && desiredFacing.Value != Mobile.Facing)
+				{
+					QueueChild(new Turn(self, desiredFacing.Value));
+					return false;
+				}
+
+				return true;
+			}
+
+			return false;
+		}
+	}
+}