File/dir dialog styles and other changes (patch 1488371):

- check invalid combinations of styles in wxFileDialogBase::Create()
- use wxFD_XXX naming convention for wxFileDialog styles
- replaces wxDD_NEW_DIR_BUTTON with wxDD_DIR_MUST_EXIST
- removes #ifdef __WXGTK24__ / #endif blocks from wxGTK code
- removes wxFileDialogBase::Get/SetStyle and wxFileDialogBase::m_fileName
- renames wxDirDialogGTK to wxDirDialog


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/filedlg.h

@@ -26,8 +26,10 @@ public:
                  const wxString& defaultDir = wxEmptyString,
                  const wxString& defaultFile = wxEmptyString,
                  const wxString& wildCard = wxFileSelectorDefaultWildcardStr,
-                 long style = 0,
-                 const wxPoint& pos = wxDefaultPosition);
+                 long style = wxFD_DEFAULT_STYLE,
+                 const wxPoint& pos = wxDefaultPosition,
+                 const wxSize& sz = wxDefaultSize,
+                 const wxString& name = wxFileDialogNameStr);
 
     virtual ~wxFileDialog() {}