API: dedicated endpoint to delete avatars

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Proposal

Avatar deletion for projects and groups (users probably work this way too, but it is not mentioned) is defined as using avatar= when editing. There should be a dedicated DELETE endpoint for this.

DELETE /groups/:group/avatar
DELETE /projects/:project/avatar
DELETE /users/avatar

I also note the lack of GET /users/avatar, {GET,PUT,DELETE} /users/:user/avatar.