Dan Brown 856fca8289
Updated CSP with frame-src rules
- Configurable via 'ALLOWED_IFRAME_SOURCES' .env option.
- Also updated how CSP rules are set, with a single header being used
  instead of many.
- Also applied CSP rules to HTML export outputs.
- Updated tests to cover.

For #3314
2022-03-07 14:27:41 +00:00
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