gui/dboxinfo: move cpu load calculation to dedicated thread ...

... that keeps history; show load graph
Revert "gui/dboxinfo: move cpu load calculation to dedicated thread ..."

This reverts commit ce189253332bb575bf99ba1a864e76c39da8677a.
gui/dboxinfo: move cpu load calculation to dedicated thread ...

... that keeps history; show load graph
Merge remote-tracking branch 'cool-next-cc/next-cc'

Conflicts:
	src/gui/dboxinfo.cpp
	src/neutrino.cpp