Add option to measure client latency #823
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$optionsHandler now correctly uses the default if not provided
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This (very crude) initial implementation adds the method enableLatencyMeasuring() to the WsServer class.
It is similar to the enableKeepAlive() method and will also keep the connections alive by pining the clients repeatedly.
But it also keeps track of the ping times and can therefore provide a latency value (in milliseconds) for each connection.
The latency can be read like any other connection property.