first steps

cave coordinates set
NPCs added to the cave
Container Drop implemented
Merge with upstream
Added crystal cave to locations menu
Added respawn timers

A possibility to set respawn timer on a per spawn basis would be more
desirable in the long run.
Conflict resolve
Added imperial outpost, fixed visibility issue

- Added force crystal hunter's cave
- Added imperial outpost NPCs
- Fixed creature visibility while mounted
- Tweaked some spawn areas
- Debugged some spawn issues
Merge remote-tracking branch 'origin/master' into ForceCrystalCave
Merge pull request #695 from CharonInferar/ForceCrystalCave

Force crystal hunters cave and some fixes