Debugger: Fix Symbian.

...which subclasses DebuggerRunner and does not call
DebuggerPlugin::startDebugger(), which connects the
engine, leading to strange malfunctions. Move functionality
to DebuggerRunner::start() to make it self-contained.
Add object names to engines for easier debugging.

Reviewed-by: hjk

src/plugins/debugger/cdb/cdbengine.cpp

@@ -217,6 +217,7 @@ CdbEngine::CdbEngine(const DebuggerStartParameters &startParameters) :
     DebuggerEngine(startParameters),
     m_d(new CdbEnginePrivate(this))
 {
+    setObjectName(QLatin1String("CdbEngine"));
     m_d->m_consoleStubProc.setMode(Utils::ConsoleProcess::Suspend);
     connect(&m_d->m_consoleStubProc, SIGNAL(processMessage(QString,bool)),
             this, SLOT(slotConsoleStubMessage(QString, bool)));