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/DiscussionSerializer.php

@@ -1,34 +1,34 @@
 <?php namespace Flarum\Api\Serializers;
 
+use Flarum\Core\Discussions\Discussion;
+
 class DiscussionSerializer extends DiscussionBasicSerializer
 {
     /**
-     * Serialize attributes of a Discussion model for JSON output.
-     *
-     * @param Discussion $discussion The Discussion model to serialize.
-     * @return array
+     * {@inheritdoc}
      */
-    protected function attributes($discussion)
+    protected function getDefaultAttributes($discussion)
     {
-        $attributes = parent::attributes($discussion);
-
-        $user = $this->actor->getUser();
-        $state = $discussion->state;
-
-        $attributes += [
+        $attributes = parent::getDefaultAttributes($discussion) + [
             'commentsCount'     => (int) $discussion->comments_count,
             'participantsCount' => (int) $discussion->participants_count,
             'startTime'         => $discussion->start_time->toRFC3339String(),
             'lastTime'          => $discussion->last_time ? $discussion->last_time->toRFC3339String() : null,
             'lastPostNumber'    => $discussion->last_post_number,
-            'canReply'          => $discussion->can($user, 'reply'),
-            'canRename'         => $discussion->can($user, 'rename'),
-            'canDelete'         => $discussion->can($user, 'delete'),
-
-            'readTime'          => $state && $state->read_time ? $state->read_time->toRFC3339String() : null,
-            'readNumber'        => $state ? (int) $state->read_number : 0
+            'canReply'          => $discussion->can($this->actor, 'reply'),
+            'canRename'         => $discussion->can($this->actor, 'rename'),
+            'canDelete'         => $discussion->can($this->actor, 'delete')
         ];
 
-        return $this->extendAttributes($discussion, $attributes);
+        Discussion::setStateUser($this->actor);
+
+        if ($state = $discussion->state) {
+            $attributes += [
+                'readTime'   => $state->read_time ? $state->read_time->toRFC3339String() : null,
+                'readNumber' => (int) $state->read_number
+            ];
+        }
+
+        return $attributes;
     }
 }