Enable CodeQL scans and fix issues found there #4897
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Found by GitHub's CodeQL scanner
Most places where it was missing were internal links and thus safe, but there's no need to have opener/referrer for those either, so no need to get warnings from code analysis tools that need to be silenced...
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There were also two cases of catastrophic backtracking in regexps which I didn't fix as those are in client-side code where the user could only slow down their own browser, so it's not really worth touching that legacy code...