STORM-2082 Implement save floater and some code cleanup.

indra/newview/CMakeLists.txt

indra/newview/llfloaterdeleteprefpreset.cpp

indra/newview/llfloaterdeleteprefpreset.h

indra/newview/llfloaterpreference.cpp

indra/newview/llfloaterpreference.h

indra/newview/llfloatersaveprefpreset.cpp

indra/newview/llfloatersaveprefpreset.h

indra/newview/llpresetsmanager.cpp

indra/newview/llpresetsmanager.h

indra/newview/llviewerfloaterreg.cpp

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

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

...view/skins/default/xui/en/panel_preferences_graphics1.xml