[MacPorts] #64820: xfce, xfce4-session, xfwm4, xfdesktop: Update to 4.16.x

[MacPorts]

#64820: xfce, xfce4-session, xfwm4, xfdesktop: Update to 4.16.x
-------------------------------------------------+----------------------
  Reporter:  syurin-nagatuki                     |      Owner:  (none)
      Type:  update                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.7.2
Resolution:                                      |   Keywords:
      Port:  xfce xfce4-session xfwm4 xfdesktop  |
-------------------------------------------------+----------------------

Comment (by barracuda156):

 Replying to [comment:6 ryandesign]:
 > Yes, somebody should update the ports, and fix the livecheck while
 they're at it. I'm not working on it anymore. There are many xfce ports so
 it is a large time commitment to do the full set of updates.

 I will have to see which other ports are there besides those in `xfce`
 folder itself. It but a few, I could probably do it, since I want to fix
 them for older systems anyway.

 Could you just help with livecheck? I assume the code will be identical,
 so if you give me a correct template, I will use it across xfce ports.

-- 
Ticket URL: <https://trac.macports.org/ticket/64820#comment:7>
MacPorts <https://www.macports.org/>
Ports system for macOS