removed LLLayoutStack::fromXML custom xml parsing

indra/llui/lllayoutstack.cpp

indra/llui/lllayoutstack.h

indra/llui/llsdparam.cpp

indra/llui/llsdparam.h

indra/llui/llview.cpp

indra/llui/llview.h

indra/llxuixml/llinitparam.cpp

indra/llxuixml/llinitparam.h

indra/llxuixml/llxuiparser.cpp

indra/llxuixml/llxuiparser.h

indra/newview/llbottomtray.cpp

indra/newview/llchathistory.cpp

indra/newview/llchathistory.h

indra/newview/llfavoritesbar.cpp

indra/newview/llfloaternotificationsconsole.cpp

indra/newview/llnearbychatbar.cpp

...a/newview/skins/default/xui/da/floater_voice_controls.xml

indra/newview/skins/default/xui/da/panel_notes.xml

...ewview/skins/default/xui/da/panel_prim_media_controls.xml

...a/newview/skins/default/xui/de/floater_voice_controls.xml