TipPluginInterface getOutput and getAttributes methods deprecated

The getOutput() and getAttributes() methods of \Drupal\tour\TipPluginInterface are deprecated.

To update your plugin, you must implement \Drupal\tour\TourTipPluginInterface. The existing base class \Drupal\tour\TipPluginBase provides implementations for 2 of the 3 new methods. The 3rd new method getBody() is a replacement for getOutput():

Before:

public function getOutput() {
  $output = '<h2 class="tour-tip-label" id="tour-tip-' . $this->getAriaId() . '-label">' . Html::escape($this->getLabel()) . '</h2>';
  $output .= '<p class="tour-tip-body" id="tour-tip-' . $this->getAriaId() . '-contents">' . $this->token->replace($this->getBody()) . '</p>';
  return ['#markup' => $output];
}

After:

public function getBody() {
  // The label is now handled by calling code.
  return [
    '#type' => 'html_tag',
    '#tag' => 'p',
    '#value' => $this->token->replace($this->get('body')),
    '#attributes' => [
      'class' => ['tour-tip-body'],
    ],
  ];
}

Most plugins would not override getAttributes(), as the base implementation reads from the tour config.
In a similar way, the replacement method getSelector() also reads from tour config.

Before

attributes:
  data-class: block-region-select

After

selector: '.block-region-select'