Removed dead code, llsdmessage, llcapabilitylistener and the associated tests.

indra/llmessage/CMakeLists.txt

indra/llmessage/llsdmessage.cpp

indra/llmessage/llsdmessage.h

indra/llmessage/tests/llsdmessage_test.cpp

indra/newview/CMakeLists.txt

indra/newview/llagent.cpp

indra/newview/llcapabilitylistener.cpp

indra/newview/llcapabilitylistener.h

indra/newview/llviewerinventory.cpp

indra/newview/llviewerregion.cpp

indra/newview/llviewerregion.h

indra/newview/tests/llcapabilitylistener_test.cpp