--help for command line interface

[Gandalf]

Ignore everything I wrote, I fucked it up myself.

I run factorio on linux and read in the release notes for 0.13.10 that it now supports a --mod-directory switch on the command line. Naturally I wanted to find out what other options are available. However neither -h nor --help gave me any clues and instead launched the game. Since you do provide some cli options I think it'd be very appropriate to add the common -h/--help/--version or at least prevent them from launching at all when unknown options are provided.

[daniel34]

Moved to Implemented Suggestions