Add save/update functionality hooks to fixed editor.

indra/newview/CMakeLists.txt

indra/newview/llenvironment.cpp

indra/newview/llenvironment.h

indra/newview/llfloaterfixedenvironment.cpp

indra/newview/llfloaterfixedenvironment.h

indra/newview/llflyoutcombobtn.cpp

indra/newview/llflyoutcombobtn.h

...newview/skins/default/xui/en/floater_fixedenvironment.xml

indra/newview/skins/default/xui/en/menu_save_settings.xml

indra/newview/skins/default/xui/en/panel_outfit_edit.xml