TableEditor not fully functional

Not all functionality of `TableEditor` that is mentioned in documentation is actually working:

**Wx editor implementation:**
Toolbar and associated actions (adding and deleting rows, search, etc.) work as expected, but sorting of the rows by clicking on columns doesn't.

**Qt editor implementation:**
Toolbar doesn't work (not implemented?) and therefore none of the actions that could be accessed via toolbar are working either. Sorting in this implementation works as expected.