Clean GUI

Changes:

• Updated pack version to support all 1.21 versions.
• Minor texture changes all round to increase consistency and fix errors.

UPDATED TEXTURES

• Recipe Book Icons made more 2d and square to fit the style.
• Updated Villager XP bar and Locked Trade texture (previously unfinished)
• Fixed an error with the Red Boss Bar.
• Updated the Potion Effects Border to fit the rest of the styling.

NEW TEXTURES

+ New Boss Bar texture matching the rest of the pack.

UPDATED TEXTURES

+ The Enchanting Table has been updated as there was an issue with the previous texture formatting an design.

First version for 1.21 (MIGHT be some textures missing, so please let me know if you find any!)