Tested and working on Paper Spigot 1.16.1 (https://papermc.io)
This is a Minecraft 1.16.1 plugin for Spigot/Paper/Bukkit with heavily commented code incase you're a learner.
It currently has a couple features:
Only a single player needs to sleep in order to change the time to day.
- Checks if the player is still sleeping before changing the time
- Only changes the time once, incase multiple people have slept at the same time.
Drops mob heads when they're killed by players.
- Not all mobs added yet
Apparently they do this in HermitCraft.
- Future versions will allow this to be toggled
- Makes shulkers drop 2 shells on death
- Prevents endermen from taking random blocks
- Disables fire from spreading
Sets the world border on server start
- Centered @ 0, 0
- 12k size, 6k out in each direction