Convert RenderUnitSpinner -> RenderUnit + WithSpinner.

Also sets correct offsets for the units that use it.

OpenRA.Mods.RA/Render/WithSpinner.cs

@@ -0,0 +1,39 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using OpenRA.FileFormats;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Render
+{
+	class WithSpinnerInfo : ITraitInfo, Requires<RenderSimpleInfo>
+	{
+		public readonly string Name = "spinner";
+		[Desc("Position relative to body")]
+		public readonly WVec Offset = WVec.Zero;
+
+		public object Create(ActorInitializer init) { return new WithSpinner(init.self, this); }
+	}
+
+	class WithSpinner
+	{
+		public WithSpinner(Actor self, WithSpinnerInfo info)
+		{
+			var rs = self.Trait<RenderSimple>();
+			var spinner = new Animation(rs.GetImage(self));
+			spinner.PlayRepeating("spinner");
+			rs.anims.Add(info.Name, new AnimationWithOffset(
+				spinner,
+				wr => wr.ScreenPxOffset(rs.LocalToWorld(info.Offset.Rotate(rs.QuantizeOrientation(self, self.Orientation)))),
+				null ) { ZOffset = 1 } );
+		}
+	}
+}