implement the GET_LOG_MARKERS request
implement the GET_LOG_MARKERS request

Requires i3 version 966c654112561b21fca076a8e967033510da9981 or later.

Airblader/i3-original,Airblader/i3,stapelberg/i3,i3/i3,Airblader/i3,cornerman/i3,cornerman/i3,Airblader/i3,Airblader/i3-original,Airblader/i3,stapelberg/i3,Airblader/i3-original,i3/i3,cornerman/i3,Airblader/i3-original,Airblader/i3-original,stapelberg/i3,cornerman/i3,stapelberg/i3,i3/i3,i3/i3