(sixplication?) among ports; as a side effect added public wxDialog methods to wxDialogBase as well and moved EndDialog() (previously implemented by wxMSW, wxMotif, wxMac and wxCocoa but not the other ports) to wxDialogBase too git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40687 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775