Replace std::ofstream/ifstream with our UTF-16 path wrapper functions

indra/llcommon/llfile.cpp

indra/llcommon/llmetricperformancetester.cpp

indra/llcommon/llmetricperformancetester.h

indra/llcrashlogger/llcrashlogger.cpp

indra/llprimitive/lldaeloader.cpp

indra/llprimitive/llmodelloader.cpp

indra/llrender/llgl.cpp

indra/llrender/llgl.h

indra/newview/llappviewer.cpp

indra/newview/llfasttimerview.cpp

indra/newview/llfilepicker.cpp

indra/newview/llmeshrepository.cpp

indra/newview/llpreviewscript.cpp

indra/newview/llscenemonitor.cpp

indra/newview/llviewertexture.cpp

indra/newview/llviewertexture.h

indra/newview/llvoavatar.cpp