CDB: Bug fixing

- Turn off initial breakpoint when attaching (terminal) and
  additionally ignore it before the first startup complete
- Refuse to step  the artifical thread created when
  interrupting
- If possible, switch to thread 0 when interupting (do not
  use artificial thread)
- Ignore non-fatal exceptions in dumper calls (stray Startup-
  complete-traps)
- Use right thread for dumper call loading
- Rename windows exception code enumeration
- Turn off modification off watch-data children by setType,
  show empty lists correctly.
- Verbose warnings about inserting invalid watch data.

src/plugins/debugger/debuggermanager.h

@@ -234,6 +234,8 @@ public slots:
 public slots: // FIXME
     void showDebuggerOutput(const QString &msg)
         { showDebuggerOutput(LogDebug, msg); }
+   void ensureLogVisible();
+
 //private slots:  // FIXME
     void showDebuggerOutput(int channel, const QString &msg);
     void showDebuggerInput(int channel, const QString &msg);