After image for animated sprites

Use this script to create an after image effect on an animated sprite in Unity.

There are two versions:

• AfterImage.cs uses a coroutine to fade the sprite.
• AfterImageLeanTween.cs replaces the coroutine with a tween using the LeanTween package.

Additionally, I'm using a separate script for sprite rotation so you can replace the one I use on line 63 if you are doing 2.5D.