support for LED indicators

Submitted by Andrey V. Panov

Assigned to Azamat H. Hackimov

Link to original bug (#8819)

Description

Xfce4-xkb-plugin has not support for LED keyboarsd indicators. These indicators are frequently used with xkb, for example:

setxkbmap "us,ru" ",winkeys" "grp:switch,grp:rwin_toggle,grp_led:scroll"

Version: 0.5.4.3