SH-4027 WIP - initial implementation of item update via AIS.

indra/llinventory/llinventory.cpp

indra/llinventory/llinventory.h

indra/llmessage/llhttpclient.cpp

indra/llmessage/llhttpclient.h

indra/llmessage/llhttpconstants.h

indra/llmessage/llurlrequest.cpp

indra/newview/llappearancemgr.cpp

indra/newview/llinventorybridge.cpp

indra/newview/llinventoryfunctions.cpp

indra/newview/llinventorymodel.cpp

indra/newview/llinventorymodel.h

indra/newview/llviewerinventory.cpp

indra/newview/llviewerinventory.h