Massive refactor

- Use contextual namespaces within Flarum\Core
- Clean up and docblock everything
- Refactor Activity/Notification blueprint stuff
- Refactor Formatter stuff
- Refactor Search stuff
- Upgrade to JSON-API 1.0
- Removed “addedPosts” and “removedPosts” relationships from discussion
API. This was used for adding/removing event posts after renaming a
discussion etc. Instead we should make an additional request to get all
new posts

Todo:
- Fix Extenders and extensions
- Get rid of repository interfaces
- Fix other bugs I’ve inevitably introduced

src/Api/Serializers/CurrentUserSerializer.php

@@ -2,20 +2,21 @@
 
 class CurrentUserSerializer extends UserSerializer
 {
-    protected function attributes($user)
+    /**
+     * {@inheritdoc}
+     */
+    protected function getDefaultAttributes($user)
     {
-        $attributes = parent::attributes($user);
+        $attributes = parent::getDefaultAttributes($user);
 
-        $actingUser = $this->actor->getUser();
-
-        if ($user->id === $actingUser->id) {
+        if ($user->id == $this->actor->id) {
             $attributes += [
-                'readTime' => $user->read_time ? $user->read_time->toRFC3339String() : null,
+                'readTime'                 => $user->read_time ? $user->read_time->toRFC3339String() : null,
                 'unreadNotificationsCount' => $user->getUnreadNotificationsCount(),
-                'preferences' => $user->preferences
+                'preferences'              => $user->preferences
             ];
         }
 
-        return $this->extendAttributes($user, $attributes);
+        return $attributes;
     }
 }