FEATURE: Update Font Awesome to v5.4.1 and SVGs (#6557)

* First take on subsetting svg icons

* FontAwesome 5 svg subset WIP

* Include icons from plugins/badges into svg sprite subset

* add svg icon support to themes

* Add spec for SvgSprite

* Misc. SVG icon fixes

* Use FA5 svgs in local-dates plugin

* CSS adjustments, fix SVG icons in group flair

* Use SVG icons in poll plugin

* Add SVG icons to /wizard

plugins/poll/assets/javascripts/widgets/discourse-poll.js.es6

@@ -39,9 +39,9 @@ createWidget("discourse-poll-option", {
     const chosen = vote.indexOf(option.id) !== -1;
 
     if (attrs.isMultiple) {
-      result.push(iconNode(chosen ? "check-square-o" : "square-o"));
+      result.push(iconNode(chosen ? "far-check-square" : "far-square"));
     } else {
-      result.push(iconNode(chosen ? "dot-circle-o" : "circle-o"));
+      result.push(iconNode(chosen ? "far-dot-circle" : "far-circle"));
     }
     result.push(" ");
     result.push(optionHtml(option));