feat(actors): listen to animationEnded callback from sprite clones

Fixes #38

gamecore/modules/world/actors/baseactor.lua

@@ -378,6 +378,7 @@ end
 function BaseActor:cloneSprite()
   if self.sprite.name ~= nil then
     self.sprite.clone = self.assets.sprites[self.sprite.name]:clone()
+    self.sprite.clone:setCallbackTarget(self)
   end
 end
 
@@ -389,6 +390,10 @@ function BaseActor:changeAnimation(animation, restart)
   end
 end
 
+function BaseActor:animationEnded(animation)
+  -- Empty placeholder function
+end
+
 function BaseActor:setCustomSpeed(customSpeed)
   if (self.sprite.clone == nil) then
     self.assets.sprites[self.sprite.name]:setCustomSpeed(customSpeed)