Axolotl Bucket Variants

Support multi-version pack formats (pack formats 15 to 999)

old, use the v15+ version

• Updated to 1.20.2 (pack format 18)

• Updated to 1.20 (pack format 15)

• Updated to 1.19.4 (pack format 13)

Updated to 1.19.3 (pack format 12)

Initial release for 1.19 (pack format 9)

Initial release for 1.18 (pack format 8)

Initial release for 1.17 (pack format 7)