• Implement WheelEvent Interface

    Note: The WheelEvent interface supports rotation in all 3 spatial
    dimensions. This implementation only supports two due to limitations
    in the Glutin compositor.
    
    The wheelevent interface is a dom interface that triggers for any
    attached device that can rotate in one or more spatial dimensions.
    Traditionally this is the mouse wheel though other devices could be
    used as well. E.g. the trackball on a trackball mouse.
    robert-snakard authored and jdm committed Jun 9, 2019