Support filtering of displayed rows in tables

[peterloron]

Currently (0.10.4, OSX 13), there appears to be no way to filter what is shown in table views. It would be handy to be able to filter down to names matching a substring, or a particular scanlist, etc.

[hmatuschek]

For now, there is a search function (Cmd+F) that allows to search the tables. However, a filter/sort function (requires a wrapper model in the Qt MVC world) is certainly helpful. To this end, I would merge issue #264 with this one, as the same wrapper model (https://doc.qt.io/qt-5/qsortfilterproxymodel.html) will do both, filtering and sorting.