Add support for Photo upload and face matching / Selfie mode :selfie:

[damienalexandre]

I wish the Secret Santa application could work with just one photo full of people.

Let's say I'm with a group of friends and everyone bring one gift. We don't know yet for whom. We could use the app in "photo mode" by taking a selfie of ourselves.

Then the app gather all the faces and the habitual workflow is started except for the messages and address stuffs.

At the end, we build a PDF the admin can either print or just read with the gifter assignments.

Then

(Demo picture from https://pxhere.com/fr/photo/1551537 - CC licensed)