Displays title of focused window in i3Wm

Dependencies: xprop, awk
i3-focusedwindow [maximum length to display]
Blank for unlimited length, i.e. output line can occupy all available space.
The recommended i3blocks config is
[i3-focusedwindow]
label=[]=
command=$SCRIPT_DIR/i3-focusedwindow 20
interval=persist