Merging the Musgrave Texture and Noise Texture nodes

[Hoshinova]

@nickberckley

I think it will be helpful if someone provided exact properties we should enter in Noise Texture to get exact texture that Musgrave had on default. So that we know how to go to same starting point as before

Input wise the only difference between the Musgrave and the new Noise node is that you have a Roughness input instead of the Dimension input and an additional Distortion input.
To get the old Musgrave behavior just leave Distortion at 0.0.
As for the Roughness input the conversion formula is Roughness=Lacunarity^{-Dimension}.