Add generic wlroots DesktopInfo for compositors such as labwc

[joshuataylor]

Compositors such as labwc use "wlroots" as their XDG_CURRENT_DESKTOP.

I like that they do that, and hope others do it as well, as it means Flameshot doesn't need to add an ∞ amount of case statements.

[mmahmoudian]

isn't Sway a wlroot? I'm also not sure about hyprland but I think that is also wlroot. If these are correct, then perhaps having them in src/utils/desktopinfo.h and src/utils/screengrabber.cpp is redundant.

[xvkdev]

isn't Sway a wlroot? I'm also not sure about hyprland but I think that is also wlroot. If these are correct, then perhaps having them in src/utils/desktopinfo.h and src/utils/screengrabber.cpp is redundant.

sway self reports as sway

✦2 ❯ echo $XDG_CURRENT_DESKTOP
sway

[RichAyotte]

Hyprland reports itself at Hyprland

✦ ❯  echo $XDG_CURRENT_DESKTOP
Hyprland

[borgmanJeremy]

Is there utility in this given sway reports as "sway" and hyrland reports as "hyprland"?