Adds NPC Necromancer Vendor.
Adds SBInfo for Necromancer Vendor.
Removed two unnecessary vendor spawns in Umbra.
Fixed <Name> from Vendors#21 up to accommodate for removed spawns.
Changed Mage  to Necromancer on Vendors#21 and Vendors#22.
Reduced max Necromancer count from 2 to 1 on Vendors#21 and Vendors#22.
Reduced MaxCount of Vendors#21 and Vendors#22 from 3 to 2.