Port resolver chain into configuration

[vicary]

This is originally meant to port the whole resolver chain into configuration, but doesn't work because some options are taken from other configuration paths.

Need to come up with a referencing mechanism of a config value from one another, along with expressions and default values.

But then creating too much custom syntax just ruined the whole idea.

  $resolvers = conf::get('web::resolvers');
  array_walk($resolvers, function($options) use($resolver) {
    if ( empty($options['enable']) || $options['enable'] ) {
      // FQCN or prepends with "resolvers\" namespace.
      if ( strpos($options['class'], '\\') === false ) {
        $options['class'] = "resolvers\\$options[class]";
      }

      $args = array(
          new $options['class']((array) $options['options'])
        );

      if ( !empty($options['weight']) ) {
        $args[] = $options['weight'];
      }

      call_user_func_array(array($resolver, 'registerResolver'), $args);
    }
  });

  unset($resolvers);

Designated config format:

  [
    {
      "class": "MaintenanceResolver",
      "weight": 999,
      "options": { "$ref": "system::maintenance" }
    },
    {
      "class": "UserContextResolver",
      "weight": 100,
      "options": {
        "setup": { "$ref": "system::environment" } // This requires a comparison expression
      }
    },
    {
      "class": "AuthenticationResolver",
      "weight": 90,
      "options": {
        "statusCode": 404
      }
    },
    {
      "class": "LocaleResolver",
      "weight": 70,
      "options": {
        "default": { "$ref": "system::i18n.localeDefault", "$default": "en_US" } // This requires a default value
      }
    }
  ]