Get attaching to a crashed Windows process right (CDB).

Handle  the 2nd parameter correctly as a event id
to be used for a handshake. Introduce a special mode
when attaching to crashed processes.
Code cleanup, pass StartParameters along to startDebugger.

src/plugins/debugger/gdb/gdbengine.h

@@ -97,7 +97,7 @@ private:
 
     void shutdown();
     void setToolTipExpression(const QPoint &mousePos, TextEditor::ITextEditor *editor, int cursorPos);
-    bool startDebugger();
+    bool startDebugger(const QSharedPointer<DebuggerStartParameters> &sp);
     void exitDebugger();
     void detachDebugger();