High-level plugin api is incompatible with non-blocking plugins

[halee88]

I attempted to adapt the udp-socket.lua plugin to be non-blocking, but the high-level API doesn't provide enough functions to support this.

I recommend adding a poll() function to the high-level api to allow a callers to choose when and how often to poll for the next osc message

[davidgranstrom]

Yes, sounds like a good addition to the API!