Feature Request: Add package for mohist server

[chlorodose]

Feature Request

Mohist Server is an minecraft server version who support Forge, NeoForge, Bukkit, Spigot APIs at the same time. We can use it as an alternative for forge server.

Problems yet to solve

• Mohist only provide md5 checksum on download while md5 checksum is unsafe and do not support by nix's fetchurl. We can download every build and calculate sha256 in update.py or wait Mohist to change it's policy.

[Infinidoge]

I do not and probably never will use Mohist, so packaging this would be extremely far down my priority list. You are free to open a pull request packaging it yourself, however.