Make `VolumeRenderImpl` a subtype of `IDrawableObject`

[ShrimpCryptid]

Use Case

Solution

• Align updateSettings in IDrawableObject with VolumeRenderImpl.
• Make VolumeRenderImpl an implementer of IDrawableObject.

Alternatives

Note:

• There could be one settings object type for volumes specifically, and another for lines/spheres/arrows/objects.