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/Controllers/AnalyticsController.php

@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * @copyright  2020 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace Analytics\Controllers;
+
+use CodeIgniter\Controller;
+
+class AnalyticsController extends Controller
+{
+    /**
+     * @var string
+     */
+    protected $className;
+
+    /**
+     * @var string
+     */
+    protected $methodName;
+
+    public function _remap($method, ...$params)
+    {
+        if (!isset($params[1])) {
+            throw \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound();
+        }
+
+        $this->className = model('Analytics' . $params[1] . 'Model');
+        $this->methodName = 'getData' . (empty($params[2]) ? '' : $params[2]);
+
+        return $this->$method(
+            $params[0],
+            isset($params[3]) ? $params[3] : null,
+        );
+    }
+
+    public function getData($podcastId, $episodeId)
+    {
+        $analytics_model = new $this->className();
+        $methodName = $this->methodName;
+        if ($episodeId) {
+            return $this->response->setJSON(
+                $analytics_model->$methodName($podcastId, $episodeId),
+            );
+        } else {
+            return $this->response->setJSON(
+                $analytics_model->$methodName($podcastId),
+            );
+        }
+    }
+}