place

Remove SnapshotProcessor, since scenario snapshots are now handled separately by the ScenarioRunManager.

Store every output in the same folder. Scenario snapshots and trajectories are handled by new processors. Adjust the TrajectoryReader.

Print header line only if the line is not empty, i.e. the keyHeaders and/or processor headers are given

This reverts commit 78db9bea.

JsonProcessorExclusionStrategy, JsonSerializerProcessor,
JsonSerializerTopography