This particular case of LLAPRFile crashes due to thread issues (and if it doesn't it might be affecting some other apr call due to using default pool).
Function is not opening the .dsf file in question and LLAPRFile won't ensure that file exists till the end of the function, it just checks that file exists at a given moment. No point to overcomplicate things by adding thread safe pool, so replaced with dirutil.

# Conflicts:
#	indra/newview/llviewerstats.cpp

SL-14862 - use nested LLSD for widget info, condensed to the two leaf-most elements of the path. Simplified floater logging.

following promotion of DRTVWR-532

This reverts commit e61f485a, reversing
changes made to 00c47d07.

following promotion of DRTVWR-519

following promotion of DRTVWR-517

following promotion of DRTVWR-513

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