src: Re-work actions and provide a callback

This re-works a bit the way we handle events, and allows to pass a
callback to the client directly.

This patch further cleans-up the older agl-shell-desktop implementation
and adds a a new action, 'deactivate' request as another example.

Further more, clients can now choose to just listen for events,
or listen for events and perform an action (activate).

Bug-AGL: SPEC-4503
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ic9f8bb1f6ff1c7f6b69f2059caac066ee106beba

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