Put settings link to new sidebar UX

Just above Search but below all other core app views.

gui/app/components/layout/master-sidebar.js

@@ -18,7 +18,7 @@ import Component from '@ember/component';
 export default Component.extend(Modals, {
 	tagName: 'div',
 	classNames: ['master-sidebar-container', 'non-printable'],
-	selectedItem: 'spaces',
+	selectedItem: '',
 	folderService: service('folder'),
 	appMeta: service(),
 	session: service(),

gui/app/pods/customize/template.hbs

@@ -1,4 +1,4 @@
-{{#layout/master-sidebar}}
+{{#layout/master-sidebar selectedItem="settings"}}
 	{{ui/ui-spacer size=300}}
 
 	<div class="section">

gui/app/templates/components/layout/master-sidebar.hbs

@@ -23,6 +23,12 @@
 					{{/link-to}}
 				{{/if}}
 			{{/if}}
+			{{#if (and session.authenticated session.isAdmin)}}
+				{{#link-to "customize.general" class=(if (eq selectedItem "settings") "option selected" "option")}}
+					<i class={{concat "dicon " constants.Icon.Settings}}></i>
+					<div class="name">Settings</div>
+				{{/link-to}}
+			{{/if}}
 			{{#link-to "search" class=(if (eq selectedItem "search") "option selected" "option")}}
 				<i class={{concat "dicon " constants.Icon.Search}}></i>
 				<div class="name">search</div>