Merge repair and rearm anim traits into WithResupplyAnimation

This is the safest approach to avoid conflicts/visual glitches when the host is responsible for both resupply types.
The new trait will simply play a looping animation as long as the actor is resupplying in any form.

OpenRA.Mods.Common/TraitsInterfaces.cs

@@ -311,7 +311,12 @@ namespace OpenRA.Mods.Common.Traits
 	}
 
 	[RequireExplicitImplementation]
-	public interface INotifyRearm { void Rearming(Actor host, Actor other); }
+	public interface INotifyRearm
+	{
+		void RearmingStarted(Actor host, Actor other);
+		void Rearming(Actor host, Actor other);
+		void RearmingFinished(Actor host, Actor other);
+	}
 
 	[RequireExplicitImplementation]
 	public interface IRenderInfantrySequenceModifier