New feature: Solo Frame handles Cue Lists and Sliders/Knobs in playback mode

[Massimo Callegari]

Hi everyone
I've added the feature as in the topic.
For those brave people building QLC+ from sources, I'd appreciate if they can help to test this feature as it seems quite important to me.

Basically this change
https://github.com/mcallegari/qlcplus/commit/a1e2857c4fb90c8aacf66beda410fd8b9abbd378
doesn't have to affect the current behaviour of Buttons, plus it has to handle the exclusivity of Cue Lists and Sliders/Knobs as well.

Any feeback is appreciated.
Attached the simple workspace I used for testing

Thanks