Add protocol level mirror support, and UI.

indra/llprimitive/llprimitive.cpp

indra/llprimitive/llprimitive.h

indra/llprimitive/llprimtexturelist.cpp

indra/llprimitive/llprimtexturelist.h

indra/llprimitive/lltextureentry.cpp

indra/llprimitive/lltextureentry.h

indra/newview/llheroprobemanager.cpp

indra/newview/llpanelface.cpp

indra/newview/llpanelface.h

indra/newview/llpanelvolume.cpp

indra/newview/llpanelvolume.h

indra/newview/llselectmgr.cpp

indra/newview/llselectmgr.h

indra/newview/llviewerobject.cpp

indra/newview/llviewerobject.h

indra/newview/llvovolume.cpp

indra/newview/llvovolume.h

indra/newview/skins/default/xui/en/floater_tools.xml