Sets a player ability
/ability <target> <ability type> <true/false>
You can fly without creative/spectator mode
/ability Steve mayfly true
to disable fly, change "true" to "false"
Can mute the player so it can't send messages
/ability Steve mute true
to unmute, change "true" to "false"
Can disable build/break on player
/ability Steve worldbuilder false
to enable build/break on player, change "false" to "true"