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

framework/core/src/Http/RouteCollection.php

@@ -43,6 +43,11 @@ class RouteCollection
         return $this->addRoute('PUT', $path, $name, $handler);
     }
 
+    public function patch($path, $name, $handler)
+    {
+        return $this->addRoute('PATCH', $path, $name, $handler);
+    }
+
     public function delete($path, $name, $handler)
     {
         return $this->addRoute('DELETE', $path, $name, $handler);