[uss_qualifier] Improve dynamic time specification #346
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Currently, uss_qualifier produces dynamic times (for telemetry, flight intents, etc) relevant to the current test run from static definitions in just one way: specifying times relative to "start of test". However, it is unclear when the "test" starts (test run? test scenario? test step?) and this does not provide enough flexibility for many use cases. For instance, a test designer may want to activate flights "now" and not at a particular time relative to the start of the "test".
This PR replaces start_of_test with a more flexible TimeDuringTest construct that allows the specification of many potentially-relevant dynamic times, initially including start of test run, start of test scenario, and "time of evaluation" (as close to "now" as is feasible).