merge plottest to unsafe with some fixes

.gitignore

demo/ball_bounces.py

demo/demo1.py

demo/demo10.py

demo/demo2.py

demo/demo3.py

demo/demo4.py

demo/demo5.py

demo/demo6.py

demo/demo7.py

demo/demo8.py

demo/example_controller1.py

demo/example_controller10.py

demo/example_controller7.py

demo/example_controller9.py

demo/example_two_car_sign_lane_switch.py

dryvr_plus_plus/example/example_agent/car_agent.py

dryvr_plus_plus/example/example_map/simple_map2.py

dryvr_plus_plus/plotter/plotter2D.py

dryvr_plus_plus/plotter/plotter_README.md