Optim: TraceRaysUnordered - optimize collider validation using burst jobs - added UtilityJobs.FlipBoolJob and ScatterToJob<T> This brings costs down across the board: * 128 rays - 0.37ms -> 0.25ms, 33% improvement (serial was 0.49ms, 49%) * 1k rays - 2.59ms -> 1ms, 61% (serial was 4.33ms, 77%) * 8k rays - 18.9ms -> 6.26ms, 67% (serial was 34.79ms, 82%) Tests: unit tests