* Support for Ueberzug backend

* Ueberzug cli argument

* Fixed slight issues according to shellcheck

* Read output suppressed

* --xoffset and --yoffset support
Co-authored-by: dylan <dylan.araps@gmail.com>

* Wrong number of snap packages reported: fixed for snap (#1274)

* Adjusted indentation and improved packages count (#1274)

* Fixed spacing in empty lines

Co-authored-by: Julian Torreno <julian@callisto.jupiter>

* Better handling of Wayland compositors

* Reinstate setting ps_flags, it's used elsewhere

* Try another incantation

* Try another incantation

* Try another incantation

* Use short options and a newline to reduce line-length

* Rework to handle the "better way" failing on some systems and fall back to the old method (which has the virtue of working most of the time).

Fixes broken size parameter from the last implementation

Added another possible name to the regex for finding cpu temperature.

This was tested on a Raspberry Pi 4 running Arch Linux ARM.

* add song= support for MellowPlayer using get_song_dbus

* adjusted indent for mellowplayer get_song_dbus

Co-authored-by: ncmprhnsb1 <ncmprhnsb1@rjc700@gmail.com>

* ascii: Update Lubuntu

* ascii: Update Xubuntu

Examples:

kib  '1020928KiB / 7117824KiB'
mib  '1042MiB / 6951MiB'
gib: '0.98GiB / 6.79GiB'

Precision level of GiB output is /not/ configurable at this stage in
time. This may be added later.

Closes #1388

Signed-off-by: Luke Yue <lukedyue@gmail.com>