Adds one entry point for both JSON and MP APIs

Removes endpoints folder and moves versions to the root
JSON API folder

lib/API/JSON/v1/Setup.php

@@ -0,0 +1,24 @@
+<?php
+namespace MailPoet\API\JSON\v1;
+
+use MailPoet\API\JSON\Endpoint as APIEndpoint;
+use MailPoet\Config\Activator;
+use MailPoet\WP\Hooks;
+
+if(!defined('ABSPATH')) exit;
+
+class Setup extends APIEndpoint {
+  function reset() {
+    try {
+      $activator = new Activator();
+      $activator->deactivate();
+      $activator->activate();
+      Hooks::doAction('mailpoet_setup_reset');
+      return $this->successResponse();
+    } catch(\Exception $e) {
+      return $this->errorResponse(array(
+        $e->getCode() => $e->getMessage()
+      ));
+    }
+  }
+}