Reduce string copies

indra/llcommon/llcurrencywrapper.h

indra/llui/llbutton.h

indra/llui/llflatlistview.h

indra/llui/lltabcontainer.cpp

indra/llui/lltabcontainer.h

indra/llui/llview.cpp

indra/newview/llaoengine.cpp

indra/newview/llaoengine.h

indra/newview/llavatarlist.h

indra/newview/llfloaterbuyland.cpp

indra/newview/llinventorypanel.cpp

indra/newview/llinventorypanel.h

indra/newview/llpanelmaininventory.cpp

indra/newview/llpanelmaininventory.h

indra/newview/llpanelplaceprofile.cpp

indra/newview/llviewerregion.cpp

indra/newview/llviewerregion.h

indra/newview/llworldmap.h