[Python] stubs - Add some missing Enums and minor fixes

[StudioWEngineers]

Part of #673. Some other improvements in Python stubs:

1. add some missing stubs for enumerators, e.g. ObjectColorSource. The numeric values have been ported from opennurbs or directly from rhino3dm.
2. fix overloads of AddPolyline in File3dmObjectTable
3. add missing property setters in Layer
4. use built-in tuple instead of typing.Tuple, which is deprecated link
5. added missing stubs for Point3dList

[fraguada]

Thanks!