cmd/syncthing: Add some common security releated HTTP headers (fixes #4360) #4361
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These:
Number 4 we already do of course, but I sprinkled some utf-8 where appropriate.
Numbers 2-3 are uncontroversial and shouldn't do any harm.
Number 1 might be an issue. Potentially for apps that wrap Syncthing (@Nutomic, @kozec, @canton7), also I recall from forums that there are people who have their own web pages that load the Syncthing UI in a part of them. I added a new GUI config option
InsecureAllowFrameLoading
to turn off this header.