v1.0-mc1.8.9

This is a one-time backport of version v1.0-mc1.20 to 1.8.9. Feel free to open an issue if you experience any problems.

Important notice: People who want to use the mod must download the file without -sources in the file name. The one that contains -sources in the file name is to be used by those who wish to view the source code of the mod.