NE A21: deQtization begins

- added FfsBuilder code and UI, but reconstruction routines for volumes,
files and sections are still not ready
- FfsOps moved to common
- QVector and QPair aren't used anymore, replaces with std::vector and
std::pair
- common classes are now independent from QObject
- next step is to replace QString with CBString from bstrlib

common/descriptor.cpp

@@ -10,7 +10,6 @@ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 WITHWARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 */
 
-#include <QObject>
 #include "descriptor.h"
 
 // Calculate address of data structure addressed by descriptor address format