[Qt] QActionGroup is needed

[Den Jean]

> 
> Den, pls, I cannot fix
> http://bugs.freepascal.org/view.php?id=15245 without QActionGroup inside 
> bindings (I'm wondering how we didn't see that missing class in last 2 
> yrs :) ).

enjoy:
http://users.telenet.be/Jan.Van.hijfte/qtforfpc/qt4pas-V1.73RC_Qt4.5.3.tar.gz
http://users.telenet.be/Jan.Van.hijfte/qtforfpc/bin-qt4pas-V1.73RC_Qt4.5.3.tar.gz
http://users.telenet.be/Jan.Van.hijfte/qtforfpc/demos-V1.73RC_Qt4.5.3.tar.gz
(temp files, will be removed after release)

when ok -> release V1.73