Cleanup new LLSD accessors and fix some api safety issues

indra/llcharacter/llbvhloader.cpp

indra/llcommon/llerror.cpp

indra/llcommon/llprocessor.cpp

indra/llcommon/llsd.cpp

indra/llcommon/llsd.h

indra/llcommon/llsdparam.cpp

indra/llcommon/llsdutil.cpp

indra/llcommon/lluri.cpp

indra/llinventory/llinventory.cpp

indra/llinventory/llsettingsbase.cpp

indra/llinventory/llsettingsdaycycle.cpp

indra/llinventory/llsettingssky.cpp

indra/llmessage/llavatarnamecache.cpp

indra/llprimitive/llmaterial.cpp

indra/llprimitive/llmodel.cpp

indra/llrender/llshadermgr.cpp

indra/llui/llconsole.cpp

indra/llui/llfloaterreg.cpp

indra/llui/llkeywords.cpp

indra/llui/llnotifications.cpp