[REQUEST] Per Core CPU usage

**Is your feature request related to a problem? Please describe.**
I can't see as many information on my CPU as I'd like because of current per-thread information instead of per-core

**Describe the solution you'd like**
Seeing as many people will have multi-core CPUs, would it be possible to show a per-core usage instead of per-thread ?

**Describe alternatives you've considered**
Plenty of other solutions around but none that I know of that will look as good and gather wanted informations in such a way. Really, a beautiful tool !

**Additional context**
Add any other context or screenshots about the feature request here.