Revert "Remove system load support"
Revert "Remove system load support"

This reverts commit 4d90fd69d75b83c5e15244f5bf1a043b3b0f83fb.

Andrwe/py3status,valdur55/py3status,alexoneill/py3status,valdur55/py3status,docwalter/py3status,ultrabug/py3status,tobes/py3status,valdur55/py3status,guiniol/py3status,ultrabug/py3status,ultrabug/py3status,guiniol/py3status,vvoland/py3status,Andrwe/py3status,tobes/py3status