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/sessionengine.cpp

@@ -31,6 +31,10 @@
 #include "breakhandler.h"
 #include "watchhandler.h"
 
+#include <utils/qtcassert.h>
+
+#include <QtCore/QDebug>
+
 namespace Debugger {
 namespace Internal {
 
@@ -40,6 +44,12 @@ namespace Internal {
 SessionEngine::SessionEngine()
     : DebuggerEngine(DebuggerStartParameters())
 {
+    setObjectName(QLatin1String("SessionEngine"));
+}
+
+void SessionEngine::executeDebuggerCommand(const QString &command)
+{
+    QTC_ASSERT(false, qDebug() << command)
 }
 
 void SessionEngine::loadSessionData()