Show more EXIF data on the photo edit screen

[roytanck]

This was suggested by Jeroen Rotty when we discussed how to spot fake AI images. Two AI images that were submitted had the software program that created them (Adobe Firefly) listed in the EXIF data. None of the fields that are currently shown in wp-admin contained any data, so EXIF appeared to be empty.

To more easily assess whether an image is real, it would be helpful to see more (or perhaps all?) EXIF fields that contain an actual value.

[coffee2code]

In 13974:

Photo Directory, Photo: Add function to retrieve all EXIF data from a photo.

See #7734.

[coffee2code]

In 13975:

Photo Directory, Admin: Show a toggle-able list of all EXIF data from a photo.

Props roytanck, jeroenrotty, coffee2code.
Fixes #7734.

[coffee2code]

In 13976:

Photo Directory, Photo: Remap deprecated and unmapped EXIF key names to meaningful names.

See #7734.