Sets up the Motion object.
If specified, it sets the client
property to theClient, x property to theX, y property to theY
and caller property to theCaller. It sets b-moveCnt to 0, completed
to FALSE and xLast and yLast to 0. It the client's cycler property
is set, it sets the client's cycler's cyclerCnt to 0. It sets
up the client's looper, then calls InitBresen().
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