The Sprite Yeet PR (ie safely remove sprites)

[patataofcourse]

Fixes #23. Also adds a small confirmation dialogue when replacing a sprite that is being used in any animations.

[CebolaBros64]

Implementation-wise everything seems to check out. Apart from the change I requested as a comment, I have a few more suggestions to the UX side of things:

• As of right now, the title of the alert window only tells the user the index of the animation. I believe this isn't very useful to the end user, and that having the animation's name in place would make more sense. (Ex.: "Sprite used in animation rishiki_beat_blue")
• It feels redundant to have two alerts confirming that the sprite is going to be deleted. Just one alert is fine.

BTW, you may also add yourself to the list in rhmodding/bread/utils/Credits.kt if you feel so inclined 🎉

[patataofcourse]

Okay, I'll add all these changes and lyk when it's done