FIX: Rename deprecated icons, allow custom icons in badges

- adds a migration renaming FA4 icon names in badges
- allows all icons to be used in badges (previously was limited to icons prefixed with fa-)
- renames remaining FA 4.7 icons equivalents

app/assets/javascripts/admin/components/admin-web-hook-status.js.es6

@@ -5,7 +5,7 @@ import { bufferedRender } from "discourse-common/lib/buffered-render";
 export default Ember.Component.extend(
   bufferedRender({
     classes: ["text-muted", "text-danger", "text-successful", "text-muted"],
-    icons: ["circle-o", "times-circle", "circle", "circle"],
+    icons: ["far-circle", "times-circle", "circle", "circle"],
 
     @computed("deliveryStatuses", "model.last_delivery_status")
     status(deliveryStatuses, lastDeliveryStatus) {

app/assets/javascripts/admin/templates/customize-colors-show.hbs

@@ -6,7 +6,7 @@
       <button {{action "save"}} disabled={{model.disableSave}} class='btn btn-primary'>{{i18n 'admin.customize.save'}}</button>
       {{/unless}}
       <button {{action "copy" model}} class='btn btn-default'>{{d-icon "copy"}} {{i18n 'admin.customize.copy'}}</button>
-      <button {{action "copyToClipboard" model}} class='btn btn-default'>{{d-icon "clipboard"}} {{i18n 'admin.customize.copy_to_clipboard'}}</button>
+      <button {{action "copyToClipboard" model}} class='btn btn-default'>{{d-icon "far-clipboard"}} {{i18n 'admin.customize.copy_to_clipboard'}}</button>
       {{#if model.theme_id}}
       {{i18n "admin.customize.theme_owner"}}
       {{#link-to "adminCustomizeThemes.show" model.theme_id}}{{model.theme_name}}{{/link-to}}

app/assets/javascripts/admin/templates/web-hooks.hbs

@@ -25,7 +25,7 @@
             <td class='description'>{{webHook.description}}</td>
             <td class='controls'>
               {{#link-to 'adminWebHooks.show' webHook tagName='button' classNames='btn btn-default no-text'}}{{d-icon 'far-edit'}}{{/link-to}}
-              {{d-button class="destroy btn-danger" action=(action "destroy") actionParam=webHook icon="remove"}}
+              {{d-button class="destroy btn-danger" action=(action "destroy") actionParam=webHook icon="times"}}
             </td>
           </tr>
         {{/each}}