Models proper exit

Use atomics to signal controller code should exit, instead of sleep and assume approach.

added 5 commits

• ec43cee2...93920cad - 4 commits from branch cds/software:master
• 10256dde - Merge branch 'master' of git.ligo.org:cds/advligorts into proper_exit

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marked this merge request as ready

assigned to @erik.vonreis

merged

mentioned in commit 3ddeb674