ENH: Start includding the scripting support

Source/cmMessageCommand.h

@@ -45,6 +45,11 @@ public:
    */
   virtual const char* GetName() { return "MESSAGE";}
 
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
   /**
    * Succinct documentation.
    */