Beamngpy

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- Add ``get_gamestate()`` to ``BeamNGpy`` class
- Make vehicle state being synched upon initial connection
- Fix vehicle state not being updated on poll if only gameengine-specific
sensors were attached.

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- Add vehicle-level state updates
- Rework code to work with existing scenarios/vehicles

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- Add support to specify polyline with per-vertex speed to the AI

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- Add wait option to step function in ``beamng.py``

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- Add basic Lidar point cloud visualiser
- Add AI control to vehicles
- Add option to attach cameras to scenarios to render frames relative to
world space

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- Restructure code to offer modular sensor model
- Implement scenario class to specify and generate BeamNG scenarios
- Implement vehicle class that offers control over vehicles and ways to
dynamically de-/attach sensors
- Implement shared memory communication to boost performance
- Add Camera sensor with colour, depth, and annotation data
- Add multi-cam support
- Add lidar sensor
- Add G-Force sensor
- Add damage sensor
- Add electrics sensor
- Add control over simulation timescale and stepping through simulation at
fixed rates
- Add example code demonstrating scenario specification with control of a
vehicle that has various sensors attached