add leave widget in wf-panel

add a widget that is able to
leave- gives all options when clicked
poweroff
logout
lockscreen
reboot
hibernate
suspend
and maybe reboot to uefi firmware.
in the right side of wf-panel

[shrinivas17081997]

https://github.com/ArtsyMacaw/wlogout

okay its close
just have to use
killall wayfire
or
pkill -u $USER
in logout command