Adds a ring to OPie for Outfitter outfits. By default only the outfits
which are allowed to be shown in the Outfitter bar will be in the ring,
making it possible to control the contents of the ring from the outfitter
settings. If you want the ring to hold all your outfits regardless of
Outfitter bar settings, change the first line of the OPie_Outfitter.lua to be
local showAll = true
Code is heavily based on Opie Equipment Manager by Timewasted, as I deemed
it unnecessary to invent the wheel again.