S60/Debugger: Add Bluetooth starter to Debugger

- Remove old rfcomm process handler from TrkGdbAdapter, use
  Bluetooth starter instead
- Synchronous connection, remove waitForTrkConnect()
- Move gdb start into Trk version answer, pass on
  settings id hint
- Prevent exit crash triggered by signal gdbProcessFinished()
- Set DebuggerNotReady correctly on AdapterStartFailed when no
  gdb is started yet

src/plugins/debugger/gdb/gdbengine.h

@@ -126,7 +126,9 @@ private: ////////// Gdb Process Management //////////
 
     AbstractGdbAdapter *createAdapter(const DebuggerStartParametersPtr &dp);
     void connectAdapter();
-    bool startGdb(const QStringList &args = QStringList(), const QString &gdb = QString());
+    bool startGdb(const QStringList &args = QStringList(),
+                  const QString &gdb = QString(),
+                  const QString &settingsIdHint = QString());
     void startInferiorPhase2();
 
     void handleInferiorShutdown(const GdbResponse &response);