make DomainServer a proper QCoreApplication instance, closes #1313
fix VoxelServer to be correctly event-driven, closes #1314
merge with upstream/master
rename in OctreeServer destructor debug
use correct cleanup calls in OctreeServer destructor
fix reference to NodeList in OctreeServer destructor
Merge pull request #1320 from birarda/cleanup

fix 100% CPU usage in DS and VS