Simplify Gamemode Command

This mod adds commands for Minecraft to simplify changing gamemodes:

/gmc : sets gamemode to creative

/gms : sets gamemode to survival

/gma : sets gamemode to adventure

/gmsp : sets gamemode to spectator

(you can add selectors to commands)

Supported versions : Forge 1.20.1, 1.16.5; NeoForge 1.21.1, 1.21.4, 1.21.8; Fabric 1.20.1; Spigot 1.21.8