feature #6537 Allow to use different icon sets in the backend (javiereguiluz)

This PR was squashed before being merged into the 4.x branch.

Discussion
----------

Allow to use different icon sets in the backend

**UPDATE**: I changed the feature behavior completely since the first implementation. We no longer include the entire Tabler icon set (it took more than 22 MB of disk space) but the feature is still flexible and allows you to use any custom icon set, including tabler.

-----

This feature is the first that uses a Twig Component. I hope to add many other components soon.

Thanks `@yceruto` for publishing a fantastic article about how to use Twig Components in bundles: https://dev.to/yceruto/bundling-your-symfony-ux-twig-components-4997

Commits
-------

ce03ecc Allow to use different icon sets in the backend

Author: javiereguiluz

UPGRADE.md

@@ -1,6 +1,19 @@
 Upgrade between EasyAdmin 4.x versions
 ======================================
 
+EasyAdmin 4.16.0
+----------------
+
+### FontAwesome Icons Are Now Inlined as SVGs
+
+As part of the new feature that allows to use custom icon sets, the FontAwesome
+icons included by default in EasyAdmin are now inlined as SVGs. The font files
+(.ttf, .woff2) and the CSS file that loads the icons have been removed.
+
+This doesn't require any change on your side, unless you were relying on the
+FontAwesome CSS classes to style the icons, which is something undocumented and
+not recommended.
+
 EasyAdmin 4.14.0
 ----------------
 

assets/css/app.css

@@ -1,7 +1,3 @@
 @import "~bootstrap/dist/css/bootstrap.min.css";
 
-@import "~@fortawesome/fontawesome-free/css/all.css";
-@import "~@fortawesome/fontawesome-free/css/v4-shims.css";
-@import "~@fortawesome/fontawesome-free/css/v5-font-face.css";
-
 @import "./easyadmin-theme/theme.css";