Initial work on dumpers for CDB.

Add dumper calls, parser etc. Catch crashes
in the dumper functions.

src/plugins/debugger/watchhandler.h

@@ -124,6 +124,7 @@ public:
 private:
 
 public:
+    int source;  // Used by some debuggers (CDB) to tell where it originates from (dumper or symbol evaluation)
     int state;
 
     // Model