Add Font Awesome 5/6 Enterprise License Support/Allow all Font Awesome CSS

I understand that Font Awesome 4.7 is built in, but if Font Awesome is a language, Font Awesome 5 Pro is a totally different dialect and Font Awesome 6 is even further evolved. We use different the three different weights of icons for different purposes, for instance. At a minimum, if the editor needs to allow all FA  classes… I would prefer to be able to insert our kit or license and choose what version we want to reference in the editor.