Implemented text boxes and tables, and further editing pages for backgrounds, borders and margins.

wxRTC functions now operate on the currently focused object, which by default is the whole buffer.
Up to three property commands are now shown on the context menu, depending on
available objects in the current hierarchy.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66680 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextprint.h

@@ -145,6 +145,7 @@ private:
     int                         m_numPages;
     wxArrayInt                  m_pageBreaksStart;
     wxArrayInt                  m_pageBreaksEnd;
+    wxArrayInt                  m_pageYOffsets;
     int                         m_marginLeft, m_marginTop, m_marginRight, m_marginBottom;
 
     wxRichTextHeaderFooterData  m_headerFooterData;