Problem:
Currently same progress stat get's displayed on statusline of all
windows. This is repeatitive and noisy.
Solultion:
Only display progress-status on the focused window
Problem:
Currently, when multiple progress are on going we show it as Progress:
{N} items {percent}% format. It can be simplified sinnce items doesn't
really add enough value for the valuable space it takes in statusline
Solution:
Change format to Progress: {percent}%({N})