v7.5.1

• Security scan clean-up. Every finding of the new code scan was reviewed. A damaged game
  image can no longer make the converter reserve a huge buffer before reading it. Every GitHub
  Action the builds use is pinned to an exact commit, and the scan now skips tests, examples and
  developer tools, which never ship. The rest (the engine opening files you choose, and fixed
  protocol constants) are by design and were closed with the reason recorded. So they stay
  fixed: the PR gate now fails on any workflow action not pinned to a commit, a CodeQL gate fails
  any change that leaves a new open alert, and the release script refuses to tag while one is open.