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Pull atomic output config doc into GitLab

The documentation for the proposed libweston atomic output configuration API is one of the last things we have left on the Phabricator wiki, which I would dearly like to kill.

It would be nice to reproduce this into a GitLab issue. The sequence diagrams can either be attached directly, or reproduced through Mermaid, which also allows for inline edits, e.g.:

sequenceDiagram
    participant Compositor
    participant libweston
    participant Backend
    participant KMS
    Compositor->libweston: Here is my output configuration
    libweston->Backend: Could you please try this output configuration
    loop Try configuration
        Backend->KMS: Hi can you apply this config
        KMS->Backend: Absolutely not
    end
    Note right of KMS: Fine I give up
    Backend->libweston: No
    libweston->Compositor: This is not a good configuration
    Compositor-->Backend: why do you always make life difficult
    Backend-->Compositor: sorry I'm doing my best over here
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