Active Measurement
data class ActiveMeasurement(val id: Int, val name: String = "M-", val startTime: Long, val startEventIndex: Int, val runs: List<RunSummary> = listOf(), val activeRun: ActiveRun? = null)
An active measurement is something a session might potentially have. Compared to FinishedMeasurement, the active measurement has mutable fields for updating the runs and meter states. Use the routine 'finish' to produce a FinishedMeasurement.