Multicore visualizer cosmetic changes - mostly regarding comments and
some other small non-functional improvements

Change-Id: I93e49b7158c916f349ad65ab3ba7d34e193b56c9
Reviewed-on: https://git.eclipse.org/r/35144
Reviewed-by: Marc Dumais <marc.dumais@ericsson.com>
Tested-by: Marc Dumais <marc.dumais@ericsson.com>