Extend XfceConsolekit/XfceSystemd API?
When looking into UPower code (https://gitlab.xfce.org/xfce/xfce4-power-manager/-/issues/146#note_71003), I noticed it calls systemd-logind/ConsoleKit2 methods `HybridSleep()`, `Hibernate()` or `PowerOff()` with the _interactive_ flag set to `FALSE`.
Would make sense extend
```
xfce_consolekit_reboot
xfce_consolekit_power_off
xfce_consolekit_suspend
xfce_consolekit_hibernate
xfce_consolekit_hybrid_sleep
xfce_systemd_reboot
xfce_systemd_power_off
xfce_systemd_suspend
xfce_systemd_hibernate
xfce_systemd_hybrid_sleep
```
to accept an additional parameter _interactive_, to be consumed by xfce4-power-manager? The use case is "System sleep mode" + "When inactive for": it should take action or do nothing. Show an authentication dialog is not useful in this case IMHO.
issue