Upgrade to FontAwesome 5 (take two) (#6673)

* Add missing icons to set

* Revert FA5 revert

 This reverts commit 42572ff

* use new SVG syntax in locales

* Noscript page changes (remove login button, center "powered by" footer text)

* Cast wider net for SVG icons in settings

- include any _icon setting for SVG registry (offers better support for plugin settings)

- let themes store multiple pipe-delimited icons in a setting

- also replaces broken onebox image icon with SVG reference in cooked post processor

* interpolate icons in locales

* Fix composer whisper icon alignment

* Add support for stacked icons

* SECURITY: enforce hostname to match discourse hostname

This ensures that the hostname rails uses for various helpers always matches
the Discourse hostname

* load SVG sprite with pre-initializers

* FIX: enable caching on SVG sprites

* PERF: use JSONP for SVG sprites so they are served from CDN

This avoids needing to deal with CORS for loading of the SVG

Note, added the svg- prefix to the filename so we can quickly tell in
dev tools what the file is

* Add missing SVG sprite JSONP script to CSP

* Upgrade to FA 5.5.0

* Add support for all FA4.7 icons

- adds complete frontend and backend for renamed FA4.7 icons

- improves performance of SvgSprite.bundle and SvgSprite.all_icons

* Fix group avatar flair preview

- adds an endpoint at /svg-sprites/search/:keyword

- adds frontend ajax call that pulls icon in avatar flair preview even when it is not in subset

* Remove FA 4.7 font files

plugins/discourse-local-dates/assets/javascripts/discourse-local-dates.js.no-module.es6

@@ -55,7 +55,9 @@
 
       const $dateTemplate = `
         <span>
-          <i class="fa fa-globe d-icon d-icon-globe"></i>
+          <svg class="fa d-icon d-icon-globe-americas svg-icon" xmlns="http://www.w3.org/2000/svg">
+            <use xlink:href="#globe-americas"></use>
+          </svg>
           <span class="relative-time"></span>
         </span>
       `;

plugins/discourse-local-dates/assets/stylesheets/common/discourse-local-dates.scss

@@ -7,7 +7,7 @@
     cursor: pointer;
     border-bottom: 1px dashed $primary-medium;
 
-    .d-icon-globe {
+    .d-icon {
       margin-right: 0.25em;
       color: $primary;
     }