staging/content-type: Content type hint support

Some monitors expose a selector for the kind of content that will get
displayed, allowing them to optimise their settings for this particular
content type.

This protocol lets clients advertise which kind of content they expect
to be displayed, per surface, so that the compositor can make more
informed decisions about the content type to set a given output in.

See wayland/weston!698

Fixes #15.

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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