merge changes for 4.0.4-release

.hgtags

doc/contributions.txt

indra/llcommon/lleventcoro.cpp

indra/llcommon/lleventcoro.h

indra/llcommon/lleventfilter.cpp

indra/llcommon/lleventfilter.h

indra/llcommon/llevents.h

indra/llmath/llrect.h

indra/llmessage/llcoproceduremanager.cpp

indra/llmessage/llcorehttputil.cpp

indra/llmessage/llcorehttputil.h

indra/llrender/llglslshader.cpp

indra/llrender/llgltexture.cpp

indra/llui/lliconctrl.cpp

indra/llui/lliconctrl.h

indra/llui/llnotifications.cpp

indra/llui/llnotifications.h

indra/llui/llnotificationtemplate.h

indra/llui/llradiogroup.cpp

indra/llui/lltextbase.cpp