- Implement CustomLaneChangeSignal
    - Implement CustomLaneChangeEvent
    - Implement CustomLaneChangeManipulator
    - Add 'CustomLaneChange' as new event type
    - Update ManipulatorExport
    - Modified OpenScenarioActions so that it handles the CustomLaneChangeEvent and sends CustomLaneChangeSignal
    - Update documentation
    - Add unit tests for CustomLaneChangeManipulator
    - Add unit tests for CustomLaneChangeEvent and CustomLaneChangeSignal