Many updates to metadata handling #936
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…mq.Msg directly. Updating Metada class to provide more data access and functions. ZMetadata is updated too. It internally now uses ConcurrentHashMap instead of the old Properties class. The Properties class ignore null values, ConcurrentHashMap reject them but ZMTP protocol allows empty values. So null values are transformed to empty strings. Metada#set is deprecated and replaced by Metada#put, to be more consistent with Map API. Lots of hostile final method declaration removed.
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org.zeromq.ZSocket and org.zeromq.ZMQ.Socket can now read and write zmq.Msg directly.
Updating Metada class to provide more data access and functions. ZMetadata is updated too.
It internally now uses ConcurrentHashMap instead of the old Properties class. The Properties class ignore null values, ConcurrentHashMap reject them but ZMTP protocol allows empty values. So null values are transformed to empty strings.
Metada#set is deprecated and replaced by Metada#put, to be more consistent with Map API.
Lots of hostile final method declaration removed.