SL-14570 - inventory validation info to ViewerStats, added QA mode setting to exercise failure cases

SL-14570 - error messages, avoid a couple of warnings caused by attempts to create folders before inventory is loaded

SL-14570 - detailed breakdown of system folder issues in inventory validation. More info about expected state of system folders in llfoldertype

following promotion of DRTVWR-507

LLHUDObject has a lot of deriveds stored as LLPointer<LLHUDObject>, no-virtual destructor is unlikely to be cause of the crash, but might be related

# Conflicts:
#	indra/newview/llfloatermodelpreview.cpp

following promotion of DRTVWR-482

LLVOAvatars and derived classes appear to be stored as LLPointer<LLViewerObject> in a lot of cases, so non-virtual ~LLViewerObject() might be triggered by LLPointer and end up not cleaning sInstances in some cases (animeshes specific?), thus causing broken pointers in sInstances.

# Conflicts:
#	indra/newview/pipeline.cpp

following promotion of DRTVWR-497