Initial Commit

- /mount
Mount a custom horse, that automatically clears when user dismounts

- /perk <type>
Receive custom item that, when right-clicked, adds a certain potion effect to user.
Item can only be used by their owner (who must also have the perm node for the effect type)

- /perkstoggle
Admin command to disable/enable plugin's features (also clears any horses in the world)