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This patch adds the PA_COMMAND_SEND_OBJECT_MESSAGE command to protocol-native so that clients can use the messaging feature introduced in the previous patch. Sending messages can in effect replace the extension system for modules. The approach is more flexible than the extension interface because a generic string format is used to exchange information. Furthermore the messaging system can be used for any object, not only for modules, and is easier to implement than extensions. Part-of: <!51>
4cdc0053