command /gm <number>:
    permission: skript.admin
    trigger:
        if arg 1 is "0":
            set player's gamemode to survival
        if arg 1 is "1":
            set player's gamemode to creative
        if arg 1 is "2":
            set player's gamemode to adventure
        if arg 1 is "3":
            set player's gamemode to spectator