__init__.py

    bpy.types.Object.coat3D = PointerProperty(type=ObjectCoat3D)
    bpy.types.Scene.coat3D = PointerProperty(type=SceneCoat3D)
    bpy.types.Mesh.coat3D = PointerProperty(type=MeshCoat3D)
    bpy.types.Material.coat3D = PointerProperty(type=MaterialCoat3D)
    bpy.app.handlers.load_post.append(load_handler)

    kc = bpy.context.window_manager.keyconfigs.addon

    if kc:
        km = kc.keymaps.new(name="3D View", space_type="VIEW_3D")
        kmi = km.keymap_items.new('wm.call_menu', 'Q', 'PRESS', shift=True)
        kmi.properties.name = "VIEW3D_MT_Coat_Dynamic_Menu"

def unregister():

    import bpy
    from bpy.utils import unregister_class

    del bpy.types.Object.coat3D
    del bpy.types.Scene.coat3D
    del bpy.types.Material.coat3D
    bpy.types.Material.coat3D_diffuse
    bpy.types.Material.coat3D_metalness
    bpy.types.Material.coat3D_roughness
    bpy.types.Material.coat3D_normal
    bpy.types.Material.coat3D_displacement
    bpy.types.Material.coat3D_emissive
    bpy.types.Material.coat3D_alpha

    kc = bpy.context.window_manager.keyconfigs.addon
    if kc:
        km = kc.keymaps.get('3D View')
        for kmi in km.keymap_items:
            if kmi.idname == 'wm.call_menu':
                if kmi.properties.name == "VIEW3D_MT_Coat_Dynamic_Menu":
                    km.keymap_items.remove(kmi)

    for cls in reversed(classes):
        unregister_class(cls)