Reliable ZeroMQ

TODO:

• Test what happens when two sockets bind to the same endpoint
• Migrate to ESLint
• Test multiple subscribers to one publisher (networked)
• Separate Ack + Response in ZMQResponse to distinguish between slow peers and slow endpoints?
• Send a closure message on Close() call, allow ZMQResponder and ZMQPublisher to free memory

Ideas:

Known Issues:

• JSONBigInt parses any string it can to bigint, e.g. "20n" to 20n, instead of its correct value of "20n"
• ExpiryMap does not reset expiry when set() overwrites an existing value. Would require a LinkedListDictionary.