Taco's Rainbow XP Bar

Restructured project and combined multiple releases.

I learned more about how resource pack compatibility works and discovered I don't actually need to update the pack_format every time. As long as the resource itself wasn't modified, I don't need to care about incompatibility warnings. This makes maintaining and versioning the project much easier.

• Merged the previous 1.19-1.20 releases into one. The only difference was the pack_format, and nothing actually changed between these releases.