qmlui: added the possibility to customize a QLC+ fader handle and track
qmlui: added the possibility to customize a QLC+ fader handle and track

kripton/qlcplus,kripton/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,kripton/qlcplus,sbenejam/qlcplus,plugz/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,plugz/qlcplus,kripton/qlcplus,plugz/qlcplus,sbenejam/qlcplus,plugz/qlcplus,plugz/qlcplus,mcallegari/qlcplus,plugz/qlcplus,mcallegari/qlcplus,kripton/qlcplus,kripton/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus,kripton/qlcplus,mcallegari/qlcplus,plugz/qlcplus