refactor(modules): extract castopod parts into a modules/ folder for a scalable HMVC structure

- create Admin, Analytics, Auth, Fediverse and Install modules in the root modules/ folder
- rename
ActivityPub to Fediverse

modules/Analytics/Models/AnalyticsUnknownUseragentsModel.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Class AnalyticsUnknownUseragentsModel Model for analytics_unknown_useragents table in database
+ *
+ * @copyright  2020 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace Modules\Analytics\Models;
+
+use CodeIgniter\Model;
+use Modules\Analytics\Entities\AnalyticsUnknownUserAgent;
+
+class AnalyticsUnknownUserAgentModel extends Model
+{
+    /**
+     * @var string
+     */
+    protected $table = 'analytics_unknown_useragents';
+
+    /**
+     * @var string
+     */
+    protected $returnType = AnalyticsUnknownUserAgent::class;
+
+    /**
+     * @var bool
+     */
+    protected $useSoftDeletes = false;
+
+    /**
+     * @var bool
+     */
+    protected $useTimestamps = false;
+
+    /**
+     * @return mixed[]
+     */
+    public function getUserAgents(int $lastKnownId = 0): array
+    {
+        return $this->where('id >', $lastKnownId)
+            ->findAll();
+    }
+}