[0453] Corrections to Prophet Skeram's area

* removed Small Obsidian Chunks
* added a third Obsidian Eradicator
* moved the three dragon NPCs
* corrected the scale of Andorgos
* added requirements for the quests dragon NPCs are giving
Merge pull request #372 from Tobschinski/merge0453

[0453] Corrections to Prophet Skeram's area
* removed Small Obsidian Chunks
* added a third Obsidian Eradicator for later usage
* moved the three dragon NPCs
* corrected the scale of Andorgos
* added requirements for the quests dragon NPCs are giving