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Deadband filter #159

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dirk-zimoch
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New link option deadband=<value>.
See https://reference.opcfoundation.org/Core/Part4/v104/docs/7.17.2.
Currently, only absolute deadbands are supported.

Numeric items with deadband > 0 will send monitors only if the absolute change is equal or greater than the deadband value. In case of arrays, one element exceeding the deadband value is sufficient to send an update of the whole array.

Non-numeric types like String cannot have a deadband. Setting up the monitored item may fail in this case with the error BadFilterNotAllowed, so that no updates are ever sent.

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Rebased onto the latest master.

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