Add discipline-keyed default tack profiles to horses and participants

Saddle is horse specific (western vs dressage) Blanket is horse specific (western vs dressage) Bit/bridle are...? Stirrups and Reins are Rider-specific

Saddle is horse specific (western vs dressage) Blanket is horse specific (western vs dressage) Bit/bridle are...? Stirrups and Reins are Rider-specific