Adds a rune to craft soulstones/shells and fixes some very minor cult related issues

Adds a rune to craft soul stones from plasma and construct shells from plasteel (25 health + 10/20 plasma/plasteel for soulstone/shell)

fixes some minor issues with the cultist tome and the icon of the teleportitem rune

Signed-off-by: dumpdavidson <gtb.schmidt@gmail.com>