merge changes for vmrg-199

doc/contributions.txt

indra/llwindow/llwindow.cpp

indra/llwindow/llwindow.h

indra/llwindow/llwindowheadless.h

indra/llwindow/llwindowmacosx.cpp

indra/llwindow/llwindowmacosx.h

indra/llwindow/llwindowmesaheadless.h

indra/llwindow/llwindowsdl.cpp

indra/llwindow/llwindowsdl.h

indra/llwindow/llwindowwin32.cpp

indra/llwindow/llwindowwin32.h

indra/newview/lloverlaybar.cpp

indra/newview/lloverlaybar.h

indra/newview/llpanelnearbymedia.cpp

indra/newview/llpanelnearbymedia.h

indra/newview/llparticipantlist.cpp

indra/newview/llparticipantlist.h

indra/newview/llvieweraudio.cpp

indra/newview/llvieweraudio.h

indra/newview/llviewermedia.cpp