Enhancement
(User-visible)
Currently Font Awesome is used in version 5.1. It should be updated to the newer version 5.13.0 to extend the icon pool. In addition the list of the `IconChooser`s should be extended, so that all Icon Fonts are contained.
Test
Select a demotype in Demo. Switch to "Edit" and open the IconChooser. Among other things, the new icon sort-amount-down-alt should be found and displayed correctly.