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[Quentin Glidic]

This patch series introduce the notification_daemon interface.
It is intended to be the standard Weston interface that all non-DE (and
probably Weston-based) compositors will have to support.

The current supported layouts are limited to the “bubbles list”, which
is the most common one. Other layout will be supported in the future.

The implementation is done as a separate module, making the feature
available to all Weston-based compositors directly.