Feature Request Attach Points Support

The ability to define attach points for specific sprites via the Sprite Editor would be awesome. Attach points are basically position placeholders that can be referenced from code in-order to spawn and place something at a specific point on a sprite. Like a fireball or a weapon. I know that you can replicate the function of attach points by having child GameObjects at specific positions, but doing so is clunky and time-consuming, especially when animations are involved. Having attach points built-in would relieve the pain of spawning things in specific positions greatly.