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/Actions/Posts/GetsPosts.php

@@ -4,12 +4,22 @@ use Flarum\Api\JsonApiRequest;
 
 trait GetsPosts
 {
+    /**
+     * @var \Flarum\Core\Posts\PostRepositoryInterface
+     */
+    protected $posts;
+
+    /**
+     * @param JsonApiRequest $request
+     * @param array $where
+     * @return \Illuminate\Database\Eloquent\Collection
+     */
     protected function getPosts(JsonApiRequest $request, array $where)
     {
-        $user = $request->actor->getUser();
+        $actor = $request->actor;
 
-        if (isset($where['discussion_id']) && ($near = $request->get('near')) > 1) {
-            $offset = $this->posts->getIndexForNumber($where['discussion_id'], $near, $user);
+        if (isset($where['discussion_id']) && ($near = $request->get('page.near')) > 1) {
+            $offset = $this->posts->getIndexForNumber($where['discussion_id'], $near, $actor);
             $offset = max(0, $offset - $request->limit / 2);
         } else {
             $offset = 0;
@@ -17,7 +27,7 @@ trait GetsPosts
 
         return $this->posts->findWhere(
             $where,
-            $user,
+            $actor,
             $request->sort,
             $request->limit,
             $offset