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/Core/DatabaseServiceProvider.php

@@ -40,6 +40,8 @@ class DatabaseServiceProvider extends ServiceProvider
             $this->app->booting(function() {
                 $resolver = $this->app->make('Illuminate\Database\ConnectionResolverInterface');
                 Model::setConnectionResolver($resolver);
+
+                Model::setEventDispatcher($this->app->make('events'));
             });
         }
     }