Allow System Binary Processor to use URLs instead of only making local files availability required

[DiegoPino]

What?

Some system binaries (exiftool, ffmpeg) can stream from a remote source without having to generate a local temporary file. The knowledge of which one can/should do this depends on the user to explore but to allow this to happen (e.g fromS3) we need to generate as argument (instead of %file we can use %url) a signed URL.

This can be a checkbox and allows that processing since e.g Droid will never be able to read from a remote stream

I think this can be done via SF3S or using the AWS S3 client directly, but I need to research it deeper

@giancarlobi @aksm @alliomeria

[DiegoPino]

@todhamma tagging you since this will be needed if you intent to transform video directly from S3