Kaba class MultiView ed

class MultiView
    var action_con: ActionController&
    var active_win: Window&
    var cam: Camera
    var mouse_win: Window&

    # functions
    func cam_move(dpos: vec3)
    func cam_rotate(dq: quaternion, cam_center: bool)
    func cam_zoom(factor: f32, mouse_rel: bool)

    # nested classes
    class Action
    class ActionConstraints
    class ActionController
    class Camera
    class SingleData
    class Window