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/Request.php

@@ -1,12 +1,19 @@
 <?php namespace Flarum\Api;
 
-use Flarum\Support\Actor;
+use Flarum\Core\Users\Guest;
+use Flarum\Core\Users\User;
 use Psr\Http\Message\ServerRequestInterface;
 
 class Request
 {
+    /**
+     * @var array
+     */
     public $input;
 
+    /**
+     * @var Guest
+     */
     public $actor;
 
     /**
@@ -14,18 +21,31 @@ class Request
      */
     public $http;
 
-    public function __construct(array $input, Actor $actor = null, ServerRequestInterface $http = null)
+    /**
+     * @param array $input
+     * @param User $actor
+     * @param ServerRequestInterface $http
+     */
+    public function __construct(array $input, User $actor = null, ServerRequestInterface $http = null)
     {
         $this->input = $input;
-        $this->actor = $actor;
+        $this->actor = $actor ?: new Guest;
         $this->http = $http;
     }
 
+    /**
+     * @param $key
+     * @param null $default
+     * @return mixed
+     */
     public function get($key, $default = null)
     {
         return array_get($this->input, $key, $default);
     }
 
+    /**
+     * @return array
+     */
     public function all()
     {
         return $this->input;