Add gocritic linter, fix a bunch of stuff #7377
Merged
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Brace yourselves! For there are many touched files here. No changes in semantics however.
Spent a long time trying out the various optional rules gocritic provides, and settled for a few of them. There are more I really like but that would take many hours to address across the codebase.
Perhaps others find gocritic too pedantic? If so, we can merge the fixes without enabling the rule.