Update Xfce to 4.16

[david]

new xfce4 version
tested on bacon with my account
tested on sigusr2 with molgen

https://www.xfce.org/download/changelogs/4.16

install cheat

bee update libxfce4util-4.16.0-0
bee update libxfce4ui-4.16.-0
bee update exo-4.16.0-0
bee update garcon-4.16.1-0
bee update tumbler-4.16.0-0
bee update xfce4-appfinder-4.16.1-0
bee update xfce4-dev-tools-4.16.0-0
bee update xfce4-panel-4.16.1-0
bee update xfce4-session-4.16.0-0
bee update xfce4-settings-4.16.0-0
bee update xfconf-4.16.0-0
bee update xfdesktop-4.16.0-0
bee update libXres-1.2.0-0
bee update xfwm4-4.16.1-0
bee update xfce4-cpugraph-plugin-1.2.0-0
bee update xfce4-mailwatch-plugin-1.3.0-0

Resolves: #2022

[pmenzel]

Do we need to inform the users about the update? Or won’t anybody notice?

[pmenzel]

Due to the wallpaper and icon changes, it might be a good idea to notify the users.

1. https://www.xfce.org/about/news/
2. https://www.xfce.org/about/tour416

[pmenzel]

As we were not able to talk about this at the meeting, no idea how to go forward. I just approve it, and volunteer to write an announcement if desired.

[thomas]

Tests done: 'Warm' update on two machines, screensaver, logout/login, reboot. All passed.