Replace wxST_MARKUP style with wxControl::SetLabelMarkup().

This is an incompatible change which removes the wxStaticText-specific
wxST_MARKUP style and adds wxControl::SetLabelMarkup() replacing it.

It doesn't actually change anything yet but it simplifies wxStaticText code a
lot by getting rid of many markup-related functions in it which had to behave
differently depending on whether wxST_MARKUP was used or not and also paves
way for adding markup support for the other controls in the future.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67055 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/univ/stattext.cpp

@@ -74,8 +74,8 @@ void wxStaticText::SetLabel(const wxString& str)
     // save original label
     m_labelOrig = str;
 
-    // draw as real label the result of GetEllipsizedLabelWithoutMarkup:
-    DoSetLabel(GetEllipsizedLabelWithoutMarkup());
+    // draw as real label the abbreviated version of it
+    DoSetLabel(GetEllipsizedLabel());
 }
 
 void wxStaticText::DoSetLabel(const wxString& str)