Register a epoch timestamp retrieval function with ArduinoCloudThing #93
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This allows class ArduinoCloudThing to obtain a 'epoch' timestamp which is used during synchronisation and which has been implemented so far via an 'extern' dependency to RTCZero. Since this kind of hidden dependency (basically a global object across 2 separate Arduino libraries) is very brittle the depdency is made clear by explicitly registering a function to provide the required timestamp.