Format 48

The pack is now in format 48, so it can be run in minecraft 1.21.

Improved Floor Detection

Withers should now reliably hover a set distance above the floor instead of sometimes phasing into it. This distance can be configured in tick.mcfunction by changing which one of the last lines is not commented out.

Added witherdown:wither_transparent Block Tag

Problematic withers now check if they are hovering the correct distance above the ground by comparing the block(s) below them against a block tag of air-equivalent blocks (eg:short_grass) rather than just air.

Made the pack.