Longer Days [DataPack]

This is probably the last update, since there is nothing more to be added/changed (except if there is some issue to be fixed)

*Automatically set the gamerule "Dodaylightcycle" to False when the datapack is loaded

*Added Uninstall function, see Description for info.

*When uninstalling, the datapack sends a message to suggest to enable Daylight Cycle.

*Removed code that relates to the sleep mechanic.

The main reason is that I've noticed that when daylihtcycle is disabled, Minecraft disables the possibility to skip the night when sleeping.

So this part of the code is useless since this is already a vanilla feature.