change package name to verse

verse/example/example_agent/__init__.py

verse/example/example_agent/ball_agent.py

verse/example/example_agent/car_agent.py

verse/example/example_agent/sign_agent.py

verse/example/example_map/__init__.py

verse/example/example_map/simple_map.py

verse/example/example_map/simple_map2.py

verse/example/example_sensor/__init__.py

verse/example/example_sensor/fake_sensor.py

verse/map/__init__.py

verse/map/lane.py

verse/map/lane_map.py

verse/map/lane_segment.py

verse/map/opendrive_parser.py

verse/plotter/__init__.py

verse/plotter/plotter2D.py

verse/plotter/plotter3D.py

verse/plotter/plotter_README.md

verse/reachability_engine/__init__.py

verse/reachability_engine/dryvr.py