Document how to extend panopoly_wysiwyg's functionality to all input formats

Somewhere between RC3 and RC5, Panopoly made the decision to restrict panopoly_wysiwyg's custom functionality (plugins, skins etc.) to only work on Panopoly's native input formats, creating an inconsistent experience for users of sites with multiple, custom input formats.

It is my opinion that Panopoly should globalize their customizations for the sake of consistency and supporting Panopoly's goal of making Drupal universally better. However, if Panopoly chooses to restrict their improvements, the documentation should be updated to instruct users how to globalize these features themselves. Below is a rudimentary code sample that could be offered:

/**
 * Implemenets hook_wysiwyg_editor_settings_alter()
 */
function MYMODULE_wysiwyg_editor_settings_alter(&$settings, $context) {
  if (module_exists('panopoly_wysiwyg')) {
    switch ($context['editor']['name']) {
      case 'tinymce':
        // Define the skin to use
        $settings['skin'] = 'cirkuit';
        
        // Define the spellchecking settings
        $settings['spellchecker_languages'] = '+English=en';
        
        break;
    }
  }
}