Added a check to see if target player is online or not if player is not online player will be sent a message and no cooldown will be given.

This bug fixed was applied to /feed <player> and /heal <player>

Moved some things around back end

Optimized some things for efficiency

Permissions update

To be able to use arguments /gm <c,s,sp,a,0,1,2,3>
Player will require the following
gm.change

They will also require any of these or all of them
gm.change.creative (Gives permissions to /gm c and /gm 1)
gm.change.survival (Gives permissions to /gm s and /gm 0)
gm.change.adventure (Gives permissions to /gm a and /gm 2)
gm.change.spectator (Gives permissions to /gm sp and /gm 3)