Exif Tool: Remove/Edit Exif

[S-Man42]

For creating Mysteries it would be great to modify the exif data.

[S-Man42]

One could use "image" library for that, I guess: https://pub.dev/documentation/image/latest/image/ExifData-class.html

[S-Man42]

Maybe it makes sense to rewrite the entire exif stuff, so that everything is based on the image lib.
Advantages:

1. Remove one dependency
2. The exif data is already part of the loaded image. So it makes sense to use it and one could directly manipulate the related objects.

https://github.com/brendan-duncan/image/blob/main/doc/exif.md

[S-Man42]

@Mike-3 maybe an issue for you if you like? Only if you find it interesting, otherwise, I guess it will be mine someday...