Move Facing and Altitude onto IMove impls, with associated pile of cleanups

OpenRA.Mods.RA/Render/RenderUnitSpinner.cs

@@ -24,14 +24,14 @@ namespace OpenRA.Mods.RA.Render
 		public RenderUnitSpinner(Actor self)
 			: base(self)
 		{
-			var unit = self.traits.Get<Unit>();
+			var move = self.traits.Get<IMove>();
 			var info = self.Info.Traits.Get<RenderUnitSpinnerInfo>();
 
 			var spinnerAnim = new Animation(GetImage(self));
 			spinnerAnim.PlayRepeating("spinner");
 			anims.Add("spinner", new AnimationWithOffset(
 				spinnerAnim,
-				() => Combat.GetTurretPosition(self, unit, new Turret(info.Offset)),
+				() => Combat.GetTurretPosition(self, move, new Turret(info.Offset)),
 				null) { ZOffset = 1 });
 		}
 	}