MDL-55564 core_admin: Convert admin settings to use templates

Part of MDL-55071

admin/templates/setting_emoticons.mustache

@@ -0,0 +1,51 @@
+{{!
+    This file is part of Moodle - http://moodle.org/
+
+    Moodle is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Moodle is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+}}
+{{!
+    Setting emoticons.
+}}
+<div class="form-group">
+    <table id="emoticonsetting" class="admintable generaltable">
+        <thead>
+            <tr>
+                <th>{{#str}}emoticontext, admin{{/str}}</th>
+                <th>{{#str}}emoticonimagename, admin{{/str}}</th>
+                <th>{{#str}}emoticoncomponent, admin{{/str}}</th>
+                <th colspan="2">{{#str}}emoticonalt, admin{{/str}}</th>
+                <th></th>
+            </tr>
+        </thead>
+        <tbody>
+            {{#emoticons}}
+                <tr>
+                    {{#fields}}
+                        <td class="c{{index}}">
+                            <input type="text" name="{{name}}[{{field}}]" class="form-text" value="{{value}}">
+                        </td>
+                    {{/fields}}
+                    <td>
+                        {{#icon}}
+                            {{>core/pix_icon}}
+                        {{/icon}}
+                    </td>
+                </tr>
+            {{/emoticons}}
+        </tbody>
+    </table>
+</div>
+<div>
+    <a href="{{reseturl}}">{{#str}}emoticonsreset, admin{{/str}}</a>
+</div>