Create Initializer using DI

[MAIPOET-1823]

lib/Config/Initializer.php

@@ -20,11 +20,16 @@ require_once(ABSPATH . 'wp-admin/includes/plugin.php');
 class Initializer {
   private $access_control;
   private $renderer;
+
   /** @var ContainerInterface */
   private $container;
 
   const INITIALIZED = 'MAILPOET_INITIALIZED';
 
+  function __construct(ContainerWrapper $container) {
+      $this->container = $container;
+  }
+
   function init() {
     $requirements_check_results = $this->checkRequirements();
 
@@ -47,8 +52,6 @@ class Initializer {
       ));
     }
 
-    $this->loadContainer();
-
     // activation function
     register_activation_hook(
       Env::$file,
@@ -89,10 +92,6 @@ class Initializer {
     ));
   }
 
-  function loadContainer() {
-    $this->container = ContainerWrapper::getInstance(WP_DEBUG);
-  }
-
   function checkRequirements() {
     $requirements = new RequirementsChecker();
     return $requirements->checkAllRequirements();