Moved these 2 procs out of obj/items/ and to obj/items/devices/soulstone

transfer_soul(var/choice as text, var/target, var/mob/U as mob).
init_shade(var/obj/item/device/soulstone/C, var/mob/living/carbon/human/T, var/mob/U as mob, var/vic = 0)

Fix some poor formatting in soulstone.dm