Separated XML and HTML rich text I/O handlers

Cleaned up XML I/O
Added HTML handler to build system
Added encoding member for saving files output


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36427 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextbuffer.h

@@ -1822,15 +1822,22 @@ public:
     virtual bool IsVisible() const { return m_visible; }
     virtual void SetVisible(bool visible) { m_visible = visible; }
 
+    /// The name of the nandler
     void SetName(const wxString& name) { m_name = name; }
     wxString GetName() const { return m_name; }
 
+    /// The default extension to recognise
     void SetExtension(const wxString& ext) { m_extension = ext; }
     wxString GetExtension() const { return m_extension; }
 
+    /// The handler type
     void SetType(int type) { m_type = type; }
     int GetType() const { return m_type; }
 
+    /// Encoding to use when saving a file. If empty, a suitable encoding is chosen
+    void SetEncoding(const wxString& encoding) { m_encoding = encoding; }
+    const wxString& GetEncoding() const { return m_encoding; }
+
 protected:
 
 #if wxUSE_STREAMS
@@ -1839,6 +1846,7 @@ protected:
 #endif
 
     wxString  m_name;
+    wxString  m_encoding;
     wxString  m_extension;
     int       m_type;
     bool      m_visible;