Handle WorkshopFileInfos.json

[KyleJamesWalker]

Allow running tts-prefetch ~/Library/Tabletop\ Simulator/Mods/Workshop/*.json without an error.

I generally just run the prefetch on my entire mods directory and it always errors out on the WorkshopFileinfos.json file

Example output:

Skipping /Users/user.home/Library/Tabletop Simulator/Mods/Workshop/WorkshopFileInfos.json likely workshop file info

[eigengrau]

Sorry for letting this lie around stale for so long!

This looks a bit too magical for my taste and I wonder whether this may make it easier for files passed on the command-line unintentionally to go unnoticed. I think the main expectation for command-line programs, when given a file of improper format, would be to complain early and loudly.

I was wondering whether it would make sense to instead allow passing a directory name on the command-line, and in this case we could be more clever about which files we actually load. This way we don’t ignore files that, according to the command-line, should be processed, but running the tool on all of the files is still more convenient than before.