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Better model spawning
Right now, to spawn bzm into the simulation world, buzzmobile/launch/simulation.launch calls the buzzmobile/launch/includes/sim_spawn_car.sh, which sleeps for 3 seconds, and then finally roslaunches buzzmobile/launch/includes/sim_spawn_car.launch, which loads up the model.
The reason for this is, reportedly, because the model can't be loaded until the world is. This issue involves finding a better way of fixing this issue, ideally through launch files only.
As mentioned in #181, we are currently not using the bash script, but not yet deleting it until we have real worlds (non-empty.world) to test that things work without it. Then we can close this issue. Alternatively, if we find that we do need the bash script to make it work, I'll keep this open until we have a better solution