More navmesh and path following optis: - Disable navmesh carving completely when new navmesh is enabled, we still had its overhead - Pin arrays before marshalling them, because unity's mono is not smart enough to do it and is copying everything which is excruciatingly slow - During path following, when calculating remaining distance, cache the rest of the path and only update the current segment we're on, instead of recalculating the length of the whole path - Add telemetry to new navmesh