Blender Git Loki

Geometry Nodes: use texture socket in Attribute Sample Texture node

There is a new Texture data-block socket that we can use in Geometry
Nodes now. This commit replaces the texture property of a node and
gives it a texture input socket instead. That increases flexibility.

The texture socket still has some limitations that will be lifted in the
next couple of days (e.g. it's not supported by the switch node and
cannot be exposed the a modifier yet).

Differential Revision: https://developer.blender.org/D11222