Remove the possibility of passing the mod-file as a string in the first shell argument
This feature is ill-designed and no longer needed by the GUI. And is not very useful: it is not possible to interact with the preprocessor without using the filesystem, since the preprocessor creates many files anyways. If we really need to reimplement such a feature, it should rather be redesigned by reading the modfile from standard input (cin). That could be triggered by using "-" as the filename argument (as is already done by several standard Unix utilities).
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