[Feature] Add for support for combined ORM Texture

[daker]

Feature Request

Allow passing an ORM or RM texture using actor.getProperty().setORMTexture()

Motivation and Detailed Description

While working on GLTF support the spec allows to provide ORM or RM data mapped in RGB channels on the same texture

• occlusion channel (Red channel)
• roughness channel (Green channel)
• metallic channel (Blue channel)

So i had to computed the texture manually using canvas.

[daker]

@martinken FYI