cookbook: Added recipe for animated rotation of an actor

cookbook: Added recipe for animated rotation of an actor

New recipe covering how to animate rotation of
an actor (in all axes).

Covers various factors affecting rotation animation
(like orientation of axes, parent rotation/orientation),
as well as trying to make rotations easier to visualise
(e.g. describing how rotation direction is affected by
those factors, how a rotation can be expected to look
when animated). Uses implicit animations for code examples.

Also refers to a full code example which uses ClutterState.