Adds *3* approved custom items to code

Adds 3 approved custom items and their sprites/paths.
http://baystation12.net/forums/viewtopic.php?f=33&t=9776
http://baystation12.net/forums/viewtopic.php?f=33&t=10197
http://baystation12.net/forums/viewtopic.php?f=33&t=10265

Paths to files are:
/obj/item/clothing/head/helmet/fluff/adapted for Serithi's item
/obj/item/clothing/mask/surgical/fluff/primitive for Ikky's item
/obj/item/weapon/cane/fluff/ryals for Meyar's item