KButtonBox port to QDialogButtonBox

[Olivier Goffart]

Hello.

Does this patch make sens:
It make KButtonBox inherit QDialogButtonBox. This allow to remove most of the 
code of KButtonBox itself.

Porting application is easy, and just require to add the button role parameter 
(usually ActionRole). Or, in some case, use KDialog button instead.

I did not remove completely KButtonBox in favor of the Qt equivalent because 
of the KGuiItem support.
The possibility to connect directly to a slot on the button creation is also a 
nice feature, that could maybe eventually go in Qt

Anyway, maybe we should rename it KDialogButtonBox ? 
(but i did not to make porting easier)

Ok to commit ?

--
Olivier (aka Gof)
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