Added MobilTemplate conversation file assignment option

NPCs can now have the conversation file assigned via mobile template
rather than the creature spawn script.
Fixed several AI bugs, listed in description

Fixed #0000061 : Houses can now be destroyed, even when not redeeding
- Added AI action regeneration when in combat
- Fixed NPC self-buffing null pointer exception
Merge pull request #1012 from CharonInferar/MobileTemplateAdditions

Fixed AI bugs, housing bugs and updated Mobile templates