Alternative Dark UI

• Updated to support Minecraft 1.21.8

• Changed look of hotbar to be (in my opinion) neater
• Fixed text shader to work with Ice Cream resource pack font

I'm only maintaining the pack for the latest version of Minecraft from now on.

• Updated gamemode switcher to fit style
• Updated achevement background sprites
• Updated toasts to fit style

• Added support for Mod Menu
• Added icons for fabric inventory tab switcher

Fixed GUI text whitening hack