Beamngpy

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- Add ``restart_scenario`` method to restart a running scenario

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- Add method to pause simulation
- Add method to resume simulation

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- Add option to specify image size when requesting vehicle state
- Add blocking method to get vehicle state
- Add method to set relative camera
- Add methods to hide/show HUD
- Default to realistic gearbox behaviour
- Add ``gear`` property to vehicle state
- Add ``gear`` as an option to vehicle input representing the gear the vehicle
is supposed to shift to.

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- Remove fstrings from documentation
- Add option to override BeamNG.drive binary being called

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- Basic IPC and example functions