detect fonts required by Beaver Builder

[leonstafford]

ie, user needed to add the following to Additional URLs:

/wp-content/plugins/bb-plugin/fonts/fontawesome/webfonts/fa-solid-900.woff
/wp-content/plugins/bb-plugin/fonts/fontawesome/webfonts/fa-solid-900.woff2
/wp-content/plugins/bb-plugin/fonts/fontawesome/webfonts/fa-solid-900.ttf
/wp-content/plugins/bb-plugin/fonts/fontawesome/webfonts/fa-solid-900.svg
/wp-includes/js/mediaelement/mejs-controls.svg

[vladstanca]

This is also an issue with elementor.