Add the ability to enable / disable and check for the editable property of a rendering engine. Implement for all three backends and extend the sample, document and unit test.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/SOC2011_WEBVIEW@68193 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/webview_webkit.h

@@ -97,6 +97,10 @@ public:
     virtual void Cut();
     virtual void Copy();
     virtual void Paste();
+    
+    //Editing functions
+    void  SetEditable(bool enable = true);
+    bool  IsEditable();
 
     // ---- methods not from the parent (common) interface
     wxString GetSelectedText();
@@ -108,9 +112,6 @@ public:
     void  SetScrollPos(int pos);
     int   GetScrollPos();
 
-    void  MakeEditable(bool enable = true);
-    bool  IsEditable();
-
     wxString GetSelection();
 
     bool  CanIncreaseTextSize();