Feature Request: parse list of inputs from a file

[Warchant]

I have a use-case to run scc on a list of files. This can be done by providing all files in CLI args.
On Windows there's a limit of 2**15 chars for a single CLI command, which limits the number of input files that can be used.

I see 2 solutions:

1. Implement "scc @flags.txt" flag parsing syntax, where flags.txt is a text file which has 1 flag per line. Related issue in cobra: Does cobra support "@file.txt" flag syntax? spf13/cobra#1649
2. Add a flag --from-file inputs.txt which will read list of input files/folders from inputs.txt.

Any feedback? I'd implement one of these features.

[boyter]

Now that's something I had not considered. I would probably want to go with option 1 out of the above since it is used elsewhere, unless its order of magnitude harder to develop.

Happy to merge this in if you do implement it!