Debugger: Print invalid when QByteArray can not be converted...

...to a numeric value for encoded debugger values.

Change-Id: I9969ea01f50738210963fa08dc871edc90c1bae2
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Fix QFile dump test for Windows.

Change-Id: I9daf0e057a3f5a274ae6b44c0c46ac7b1e036fe6
Reviewed-by: hjk <hjk121@nokiamail.com>