Swipe to browse through photos

This is surprisingly hard, and was disabled as part of implementing https://github.com/bnolan/echt-client/issues/39. I think doing this via react-navigation is abusing their API a bit.

Our best shot would be to partially reimplement the `` and offset based approach from https://github.com/halilb/react-native-photo-browser. The library itself is a bit too clumsy, it makes too many assumptions on how your detail views are rendered (e.g. no ability to add a "delete" button). We could try to work with the library author to create custom detail views of course.

Past research (from Slack):

https://github.com/alwx/react-native-photo-view - the one we’re using, no nav capabilities
https://github.com/dwqs/react-native-image-viewer - no actions or custom views
https://github.com/ascoders/react-native-image-viewer - might be ok, but … japanese? 5 contributors only
https://github.com/BondGoat/react-native-photo-viewer - single contributor
https://github.com/oblador/react-native-lightbox - quite popular, can have custom views, but no nav
https://github.com/halilb/react-native-photo-browser - includes grid rendering, action buttons, nav
https://github.com/phil-r/react-native-looped-carousel - nav, but no image pan/zoom
https://github.com/sprightco/react-native-NYTPhotoViewer - wrapper for native ios (no android)

Start by reviewing the implementation disabled for issue #39 and the listed react-native photo-view and photo-browser libraries. Compare their navigation, custom detail-view, action-button, and pan/zoom capabilities against the app's needs. Done means users can swipe through photos while retaining the required custom actions and detail rendering.

Written by the indexing model from the issue text.