turtle and netherite armor for horses

next update being basically mount focused, lets not forget to return to existing horses too

turtle armor coming in green shell texture for horses, crafted of turtle scutes in same shape as leather horse armor, just of turtle scutes, could let your horse carry you over water alongside protection, that unless horses would finally be let to carry riders over water (not ride on sea floor)

netherite armor coming in netherite shades, crafted of diamond horse armor and netherite ingots, offering superior protection to horses, as well as resistance to "startling" horse (making it stand on two legs for a while and unable to run) instead of knockback resistance, which horse do not necessarily need