[imagick] Strip GPS data from EXIF if present

[imorland]

With https://github.com/flarum/core/pull/3195, it will be possible to use imagick as the driver for Intervention/image, which is used to resize, orientate, etc images.

As pointed out https://github.com/flarum/core/pull/3195#issuecomment-991967527, this could be an issue moving forward.

Let's at least add an option to strip GPS data from uploaded images.

[clarkwinkelmann]

Makes sense. Should the option directly be to erase all exif data? That way every potential info is covered with a single setting.