just a port to a new version.

this is kind-of-beta because some integration with other mods is disabled (the one probe, polymorph, etc.).  when they update to 1.21.11, i'll have to put the support back. hopefully someone will let me know.

terafirmacraft isn't supported either but i probably have a year before they update.

i will not be maintaining 1.21.8. 1.21.1 remains fully supported, 1.20.1 minimally supported.