Matrix4x4 parameters not exposed to Materials

Matrix4x4 properties are not exposed in the material, which is to say they do not appear in the Properties block in code and cannot be set using MaterialPropertyBlocks. I don't actually know when the blocks started supporting Matrix4x4 or if they always did, but it would be nice to see this supported in Shader Forge so that a material doesn't have to be instanced to set a matrix.

(Attempting to create Matrix4x4s in the Code node also floods the console with "Invalid component count check of custom value type: Matrix4x4", but that's a separate issue)