pull pack late beta fixes from 2.6.3

.hgtags

doc/contributions.txt

indra/llcommon/CMakeLists.txt

indra/llcommon/lleventdispatcher.cpp

indra/llcommon/lleventdispatcher.h

indra/llcommon/llevents.cpp

indra/llcommon/llevents.h

indra/llcommon/llinstancetracker.cpp

indra/llcommon/llinstancetracker.h

indra/llcommon/llsdutil.cpp

indra/llcommon/llsdutil.h

indra/llcommon/llversionviewer.h

indra/llcommon/tests/lleventdispatcher_test.cpp

indra/llrender/llgl.cpp

indra/llrender/llgl.h

indra/llrender/llimagegl.cpp

indra/llui/llfloaterreglistener.cpp

indra/llui/llfloaterreglistener.h

indra/llui/lllineeditor.cpp

indra/llui/lllineeditor.h