More detailed progress display, remaining time estimate

[spotlesscoder]

Is your feature request related to a problem? Please describe.
Large folder takes forever, I'm not even sure dupeGuru is really working on it as the progress bar is stuck at 20%

Describe the solution you'd like
I want the UI to show more details on what the program is doing while scanning very very large folders
Also, I want to see what the program has already found out as soon as a duplicate is found and also give a rough estimate of the remaining scanning time

Describe alternatives you've considered
None so far

Additional context