ftp/net2ftp: Update to 1.4

Changes:

• net2ftp is now compatible with PHP version 8
• The Java upload applet has been removed, as applets are not supported any longer in Firefox and Chrome
• The CKEditor has been removed, as the latest version 5 build 25.0.0 inserts strange symbols into the text
• The jQuery libraries are now loaded from Google, and only on the pages where they are required (to improve page loading times)
• Thanks to php-download.com for providing a ready to use version of phpseclib.