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/Users/Commands/EditUserHandler.php

@@ -0,0 +1,75 @@
+<?php namespace Flarum\Core\Users\Commands;
+
+use Flarum\Core\Users\User;
+use Flarum\Core\Users\UserRepositoryInterface;
+use Flarum\Core\Users\Events\UserWillBeSaved;
+use Flarum\Core\Support\DispatchesEvents;
+
+class EditUserHandler
+{
+    use DispatchesEvents;
+
+    /**
+     * @var UserRepositoryInterface
+     */
+    protected $users;
+
+    /**
+     * @param UserRepositoryInterface $users
+     */
+    public function __construct(UserRepositoryInterface $users)
+    {
+        $this->users = $users;
+    }
+
+    /**
+     * @param EditUser $command
+     * @return User
+     * @throws \Flarum\Core\Exceptions\PermissionDeniedException
+     */
+    public function handle(EditUser $command)
+    {
+        $actor = $command->actor;
+        $data = $command->data;
+
+        $user = $this->users->findOrFail($command->userId, $actor);
+
+        $user->assertCan($actor, 'edit');
+
+        $attributes = array_get($data, 'attributes', []);
+
+        if (isset($attributes['username'])) {
+            $user->assertCan($actor, 'rename');
+            $user->rename($attributes['username']);
+        }
+
+        if (isset($attributes['email'])) {
+            $user->requestEmailChange($attributes['email']);
+        }
+
+        if (isset($attributes['password'])) {
+            $user->changePassword($attributes['password']);
+        }
+
+        if (isset($attributes['bio'])) {
+            $user->changeBio($attributes['bio']);
+        }
+
+        if (! empty($attributes['readTime'])) {
+            $user->markAllAsRead();
+        }
+
+        if (! empty($attributes['preferences'])) {
+            foreach ($attributes['preferences'] as $k => $v) {
+                $user->setPreference($k, $v);
+            }
+        }
+
+        event(new UserWillBeSaved($actor, $actor, $data));
+
+        $user->save();
+        $this->dispatchEventsFor($user);
+
+        return $user;
+    }
+}