Minor map fixes

• The way to Vengoth Castle was reviewed.
• Minor fix in Ankrahmun, ref #1190
• Fixed a map fail in Rookgaard
• Added npc A Dark Priestess, ref #1170

changes based on
https://www.youtube.com/watch?v=ovGxKe8g9vk
http://tibia.wikia.com/wiki/A_Dark_Priestess