frontend: add support for showing raised hand

Show the "hand-paper" symbol instead of the "circle" symbol while a
user is raising their hand.

static/galene.css

@@ -1204,6 +1204,10 @@ header .collapse {
     font-weight: 900;
 }
 
+#users > div.user-status-raisehand::before {
+    content: "\f256";
+}
+
 .close-icon {
     font: normal 1em/1 Arial, sans-serif;
     display: inline-block;

static/galene.js

@@ -1997,15 +1997,19 @@ function addUser(id, name) {
 
 /**
  * @param {string} id
- * @param {string} name
+ * @param {user} userinfo
  */
-function changeUser(id, name) {
+function changeUser(id, userinfo) {
     let user = document.getElementById('user-' + id);
     if(!user) {
         console.warn('Unknown user ' + id);
         return;
     }
-    user.textContent = name ? name : '(anon)';
+    user.textContent = userinfo.username ? userinfo.username : '(anon)';
+    if (userinfo.status.raisehand)
+        user.classList.add('user-status-raisehand');
+    else
+        user.classList.remove('user-status-raisehand');
 }
 
 /**
@@ -2034,7 +2038,7 @@ function gotUser(id, kind) {
             scheduleReconsiderParameters();
         break;
     case 'change':
-        changeUser(id, serverConnection.users[id].username);
+        changeUser(id, serverConnection.users[id]);
         break;
     default:
         console.warn('Unknown user kind', kind);