Formatscaper: Add list of files to ignore (or override their file format and skip identification)

While entire input files can be ignored, this may not be enough: Sometimes we might want to (re-)investigate most files contained in a ZIP file but exclude a few files that we know aren't relevant (e.g. because we're sure that they're ok for some reason).
This could massively speed up execution time.

Such a mechanism could also be useful for skipping the file identification task, and simply asserting the files to have a certain format for the results. For example, we know that the S1GBM files are GeoTIFF files -- it shouldn't be necessary to re-identify those terabytes of files every time the tool runs.