initial work changing topctrl to popup layer

indra/llui/llcombobox.cpp

indra/llui/llfloater.cpp

indra/llui/llfocusmgr.cpp

indra/llui/llfocusmgr.h

indra/llui/llhandle.h

indra/llui/llmodaldialog.cpp

indra/llui/llui.cpp

indra/llui/llui.h

indra/llui/llview.cpp

indra/newview/CMakeLists.txt

indra/newview/llappviewer.cpp

indra/newview/llexpandabletextbox.cpp

indra/newview/llexpandabletextbox.h

indra/newview/llfolderview.cpp

indra/newview/llpanelnearbymedia.cpp

indra/newview/llpanelnearbymedia.h

indra/newview/llprogressview.cpp

indra/newview/llsplitbutton.cpp

indra/newview/lluploaddialog.cpp

indra/newview/llviewerwindow.cpp