Added Collector Signal #227
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I think a more generic collector signal fits our usecase better than a Signal only intended for HTTP. This way it can e.g. also be used to poll kubernetes metrics. The
CollectorSignalis an ABC that needs to have acollect()function implemented which is run as a daemon thread and updates the internal value to be returned innow(). Using such a collector does not slow down the simulation opposed to running e.g. an HTTP query every time now() is called.closes #215 :)