[FEATURE REQUEST] Remove Diffuse Color

[RuggeroVisintin]

Is your feature request related to a problem? Please describe.
When defining a diffuse color, there is no way to remove it other than manually tweaking the scene file

Describe the experience you'd like
Be able to define whether the diffuse color should be rendered or not

Describe alternatives you've considered

material.showDiffuseColor = true|false;

Additional context
Will also require changes to the core engine