Avoid locking GIL on PVXS worker threads #101
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A potential optimization to further offload work from the shared PVXS threads. When fully implemented, this would avoid locking the python GIL on PVXS threads.
Currently, this is only implemented for client subscriptions with the thread and asyncio frontends.
There is an anomalous test failure with asyncio on windows+py3.6 which I don't yet understand.