Changed pack format number from 15 to 18 for 1.20.2
Support for the new supported_formats field in pack.mcmeta.
This means that the pack will not require updates for every Minecraft version to avoid the unsupported pack warning. Updates will only be necessary if a problem shows up in future versions.
Changed pack format number from 13 to 15 for 1.20
Changed pack format number from 12 to 13 for 1.19.4
Changed pack format number from 9 to 12 for 1.19.3
