Alpha Update for 1.21-pre1

Changes:

• Remove PortalHorse as they added it to vanilla
• Minor changes to Identifiers of mounted modifiers
• Major rewrite of all rendering code

How to use:

ModMenu/ClothConfig don't exist for 1.21 yet. Download their latest versions and the mod will work.

Edit config/HorseBuff.toml if you need to edit config.

Known issues:

Opening ModMenu crashes the game. Unsure if this is at fault of ModMenu/ClothConfig

Partally translucent horses (from looking down with Horse Fade enabled) often hide stuff that is rendered behind them, even with graphics set to Fabulous!