refactor(analytics): move all analytics files to a new Libraries/Analytics folder

- add page hit on podcast activity page
- update development docs

app/Libraries/Analytics/Models/AnalyticsUnknownUseragentsModel.php

@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * 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 Analytics\Models;
+
+use CodeIgniter\Model;
+
+class AnalyticsUnknownUseragentsModel extends Model
+{
+    protected $table = 'analytics_unknown_useragents';
+    protected $primaryKey = 'id';
+
+    protected $allowedFields = [];
+
+    protected $returnType = \Analytics\Entities\AnalyticsUnknownUseragents::class;
+    protected $useSoftDeletes = false;
+
+    protected $useTimestamps = false;
+}