Merge from viewer-development post 2.4 release

.hgtags

BuildParams

doc/contributions.txt

indra/cmake/PulseAudio.cmake

indra/llcommon/llprocesslauncher.cpp

indra/llcommon/llversionviewer.h

indra/llmessage/llavatarnamecache.cpp

indra/llui/CMakeLists.txt

indra/llui/llcheckboxctrl.cpp

indra/llui/llcombobox.cpp

indra/llui/llfloater.cpp

indra/llui/llhandle.h

indra/llui/lllayoutstack.cpp

indra/llui/lllayoutstack.h

indra/llui/lllineeditor.cpp

indra/llui/lllineeditor.h

indra/llui/llmenugl.cpp

indra/llui/llmenugl.h

indra/llui/llnotifications.cpp

indra/llui/llnotifications.h