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Some embedders prefer to minimise the number of semantics node/custom action updates sent back to the host platform -- for example due to expensive serialisation mechanisms, etc. This patch provides a 'batch end' signal that provides embedders with an indication of when a self-consistent set of semantics node or custom action updates have been sent. We overload the node/action ID with information that conveys a batch end by using an ID (-1) that is never allotted to semantics nodes by the framework.