NodeCore Extended Rotating

This mod follows in the footsteps of the useful Extended Placement mod for Minetest and adds the ability to rotate certain nodes from NodeCore such as optics and doors easily, without having to cycle through all possible rotations every time.

Rotating a node can be done in two ways, either by clicking the center or the edge of a face. By interacting with the center, the node rotates around that face. When interacting with the edge, the node is "pushed" that way, rotating away from you. Sneaking inverts the direction of the rotation.

At this time, nodes that can be rotated are hardcoded into the mod, since their valid orientations can't be easily extracted. A function mimicking NodeCore's own rotation logic has to be provided.