Introduce resource_cast<> helper function
Getting the object associated with the particular wl_resource is not difficult, but it involves a pretty reasonable amount of boilerplate code. This change, introduces a helper function with an intend to reduce the amount of boilerplate code. It can be used as resource_cast<const ObjectPrivate *>(resource) or just simply resource_cast<ObjectPrivate *>(resource).
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1c412b0f
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