KisSliderSpinBox api change

[Sven Langkamp]

Hi,

when looking at the recent changes to use the new slider I found several
places where is wasn't used correctly. (using the integer methods that does
consider the factor)
Therefor I propose the api changed in the attached patch. By not longer
inheriting from QAbstractSlider it hides the internal api.

That way we can still use the current value/setValue and valueChanged
signal.

When changing a slider the signal connection needs to be checked, because
the old slider often had different parameter there.
I know it's a bit stupid to change it now, but it reduces the risk of using
the api in the wrong way.


Sven
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