Add compatibility with jQuery 3 and remove some deprecated JS code

Frontend and backend JS code generated various warnings or fatal
errors due to the deprecation of some functions in jQuery 3.
The fatal errors made the plugin incompatible with WordPress 5.6.

- Replaced jQuery mobile with Andrés Zsögön's jquery.events.swipe
library for handling swipe events on mobile and mouse drag events on
desktop. jQuery mobile is not compatible with jQuery 3, so it could no
longer be used.
- Replaced some jQuery functions that were still present in jQuery 3 but
considered deprecated.

crellyslider.php

@@ -3,7 +3,7 @@
  * Plugin Name: Crelly Slider
  * Plugin URI: https://wordpress.org/plugins/crelly-slider/
  * Description: A free responsive slider that supports layers. Add texts, images, videos and beautify them with transitions and animations.
- * Version: 1.4.3
+ * Version: 1.4.4
  * Author: Fabio Rinaldi
  * Author URI: https://github.com/fabiorino
  * Text Domain: crelly-slider
@@ -18,7 +18,7 @@
 
 define('CS_DEBUG', true);
 
-define('CS_VERSION', '1.4.3');
+define('CS_VERSION', '1.4.4');
 define('CS_MIN_CAPABILITY', 'manage_options');
 define('CS_PATH', plugin_dir_path(__FILE__));
 define('CS_PLUGIN_URL', plugins_url() . '/crelly-slider');

css/crellyslider.css

@@ -2,7 +2,7 @@
  * Plugin Name: Crelly Slider
  * Plugin URI: https://wordpress.org/plugins/crelly-slider/
  * Description: A free responsive slider that supports layers. Add texts, images, videos and beautify them with transitions and animations.
- * Version: 1.4.3
+ * Version: 1.4.4
  * Author: Fabio Rinaldi
  * Author URI: https://github.com/fabiorino
  * License: MIT
@@ -19,6 +19,11 @@
   	font-family: 'Verdana', sans-serif;
 }
 
+.crellyslider,
+.crellyslider * {
+	touch-action: pan-y; /* Needed for swipe-left and swipe-right on mobile */
+}
+
 .crellyslider a {
 	color: #0073aa;
 }