Added rich text buffer clipboard support.

Added double-left-click word selection support.
Now saves only the active attributes to XML.
Eliminated wxRichTextFragment class to allow  wxRichTextBuffer
to be used where wxRichTextFragment was used.
Fixed AddParagraph virtual function hiding warning.
Miscellaneous small wxRichTextCtrl bug fixes and cleanup.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41542 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextctrl.h

@@ -390,6 +390,9 @@ public:
     /// Clear the selection
     virtual void SelectNone();
 
+    /// Select the word at the given character position
+    virtual bool SelectWord(long position);
+
     /// Get/set the selection range in character positions. -1, -1 means no selection.
     /// The range is in API convention, i.e. a single character selection is denoted
     /// by (n, n+1)