PBR: Synced 3D/2D editor

This is part of a bigger proposal:

-Layer stystem proposal

Synced 3D/2D editor

When texturing it's important to see the same result both in 3d and in 2d. Syncing these two will make it easier and more streamlined. Some things are already synced, like painting and selection. The following things could be synced:

-Lighting (studio/matcap/flat)

-Channels, mask and baked maps (ambient occlusion etc.)

-viewer node (from node wrangler addon)