frontend: Snapshot library: view EXIF data

[ES-Alexander]

Current behaviour

We automatically store some EXIF data when capturing snapshots, but users need to open them in some other program to be able to view/query that.

Expected or desired behaviour

It would be nice if we could just expose it directly as part of a preview in the snapshots library.

Prerequisites

• I have checked to make sure that a similar request has not already been filed or fixed.