STORM-986 : pull into viewer-development

indra/llplugin/llpluginclassmedia.cpp

indra/llplugin/llpluginclassmedia.h

indra/llplugin/llplugininstance.cpp

indra/llplugin/llplugininstance.h

indra/llplugin/llpluginprocesschild.cpp

indra/llplugin/llpluginprocesschild.h

indra/llplugin/llpluginprocessparent.cpp

indra/llplugin/llpluginprocessparent.h

indra/newview/llviewermedia.cpp

indra/test_apps/llplugintest/llmediaplugintest.cpp