Add place holder artifact quests (#172)
* Added placeholder artifact quests, cleaned up existing ones
There were a bunch of artifact encounters which lacked associated quests, making those artifacts unavailable. I added placeholders to make artifacts available.
I noticed that ArtifactID and Init() were using identical hard coded strings, so I replaced that with a new m_artifactID property and moved hard coded properties and accessors to the beginning of the files to make them more visible.
* Added placeholder encounter for Braggart's Bow artifact
* Add new artifact encounter and quest placeholders
