Add access to Photos with EXIF filter

[blochberger]

Ideally a GUI should be added, like the photo chooser that is already present on iOS, that in addition to selectively providing access to user-chosen photos, should also strip EXIF meta data from the accessed photos by default.

The privacy issues caused by EXIF metadata are demonstrated nicely by Felix Krause [1].

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1. Felix Krause, iOS Privacy: detect.location - An easy way to access the user's iOS location data without actually having access, 2017