Ensure the result of GpsLocation is consistant when running the regression tests

[stefanlenselink]

While preparing a different pull request and running the regression tests tests in metadata-extractor-images for both mov and mp4 files differ in the GpsLocation.

The cause is the Metadata tag is starting with a copyright symbol; while the source-code did not have any / use to have it but it's not there anymore.

Proposed solution is to strip-off the Copyright (and for completeness the @ symbol) and possibly any localisation and compare to the base tag name.

Inspriration / comments taken from: https://exiftool.org/TagNames/QuickTime.html

[drewnoakes]

Thanks, this looks good. I'll need to pull it down and run across the regression suite to see what's what.

Also I've been slowly working to improve IsoBmff parsing, which would help with this here. We'd be comparing the original byte arrays, rather than strings (which can hit problems with encoding).