Improve the detection of a banner image. (!1527) · Merge requests · Framasoft / Mobilizon

This Pull request is not tested and done by someone totally new to Elixir. It tries to improve the detection of the banner image.

Also accept attachments of type Image
Prefer the key "image" if it is set as the banner image (https://www.w3.org/TR/activitystreams-vocabulary/#dfn-object)
solves #1399 (closed)

ToDo: add tests

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