cpu_temp: Add support for Zen processors

This adds support for Zen based processors(AMD family 17h) like the Ryzen series using the k10temp module.
This requires either having a patched kernel with the hwmon updates see - lkml.org/lkml/2017/9/6/684
Or kernel 4.15+ where the patch was merged.

Add 'setroot' wallpaper fetching

Fix packages count for exherbo

Installed packages data is stored in

/var/db/paludis/installed/data/*

and the cross-installed packages data is stored in

/var/db/paludis/cross-installed/arch/data/*

where arch could be every cpu arch supported by exherbo.

general: Remove unsafe splitting.