+ Added /gmsp, /gm3 gamemode spectator + Command message + config editing.
+ Added /gma, /gm2 gamemode adventure + Command message + config editing.
+ Added title message and sub title message on player join + config editing.
+ Fixed the perm node for gamemode survival. "coreessentials.gamemode.survival"
+ Added the option to change the pitch of the sound on player join.