Refactor renderers to use templates

mailpoet/lib/EmailEditor/Engine/Renderer/ContentRenderer/BlocksParser.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\EmailEditor\Engine\Renderer\ContentRenderer;
+
+use WP_Block_Parser;
+
+class BlocksParser extends WP_Block_Parser {
+  /**
+   * List of parsed blocks
+   *
+   * @var \WP_Block_Parser_Block[]
+   */
+  public $output;
+
+  public function parse($document) {
+    parent::parse($document);
+    return apply_filters('mailpoet_blocks_renderer_parsed_blocks', $this->output);
+  }
+}