Better Hearts (and HUD)

Edits sprites for almost all HUD elements to be more inline with Minecraft's modern artstyle

Supports down to 1.21.9 as far as I'm aware, purely because thats when min_format and max_format was added, and I don't want to check through every minecraft version to find when my resource pack starts working, so thats a good enough cut off and set the min format to 65, as low as it can be without also adding the supported formats subsection

who even plays old versions anyway (I know lots of people do)