int32 Frame
The Simulation Frame number we are computing in this tick, E.g, the output frame. This is the global, everyone agrees-upon frame number. E.g, the "server frame" number. This will be 1 the first time ::SimulationTick runs. (0 is the starting input and is not generated in a Tick) (globally for fix tick, local tick and per-sim for remote independent sims)