Update changelog: widget configuration, settings clean-up, url fix in about dialog.
Update changelog: widget configuration, settings clean-up, url fix in about dialog.

0359xiaodong/SeriesGuide,UweTrottmann/SeriesGuide,epiphany27/SeriesGuide,r00t-user/SeriesGuide,hoanganhx86/SeriesGuide,artemnikitin/SeriesGuide,UweTrottmann/SeriesGuide