[FR] - All command line options that take a filename should also take "-"

[newhoggy]

Internal/CLI

All command line options that take a filename should also take "-". These can be found by searching for metavar "FILE" in the source code.

When - is given to these options, the behaviour should depend on whether or not the file is an input or output file. If it is an input file, then the input should read from stdin. If it is an output file, then the output should write to stdout.

The change should otherwise be backwards compatible.

[github-actions]

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