Text fields that sanitize values as URLs.

Only valid URLs or URIs will save in these fields.

1. Example 1: Basic Link Field

   add_action( 'fm_post_post', function() {
   	$fm = new Fieldmanager_Link( array(
   		'name' => 'demo-link',
   	) );
   	$fm->add_meta_box( 'Basic Link Field', array( 'post' ) );
   } );