Use vtable for protocol_view member function forwarding - #174
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Adds a data-pointer and vtable-pointer member to
protocol_viewenabling member function forwarding.protocolremains signature-only for member functions as ownership makes implementation slightly trickier.Overloads are still unsupported.
protocol_view<const T>needs to be added as constructingprotocol<T>from aconstobject is (correctly) not allowed.