Merge branch 'SL-14862' into DRTVWR-527-maint

indra/llui/CMakeLists.txt

indra/llui/llbutton.cpp

indra/llui/llfloater.cpp

indra/llui/llfloaterreg.cpp

indra/llui/lltabcontainer.cpp

indra/llui/lltoolbar.cpp

indra/llui/lluictrl.cpp

indra/llui/lluictrl.h

indra/llui/lluiusage.cpp

indra/llui/lluiusage.h

indra/newview/llchatbar.cpp

indra/newview/llfloaterimnearbychat.cpp

indra/newview/llstartup.cpp

indra/newview/llviewermessage.cpp

indra/newview/llviewerstats.cpp

indra/newview/llworldmipmap.cpp