code: public function boot()
      {
          $pluginFolders = $this->configurationHandler->pluginFolders();
          $this->core = $this->findPlugins($this->configurationHandler->corePluginsDir() . "/Core");
          foreach ($pluginFolders as $pluginFolder) {
              $this->blocks += $this->findPlugins($pluginFolder . "/Block");
              $this->themes += $this->findPlugins($pluginFolder . "/Theme");
          }
  
          return $this;
      }
docs: Boots the plugin manager
  
  @return $this