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 three ways:

• Click near the center of a face, and the node rotates 90° around it.
• Click near an edge, and the node will be rotated 90° away from you.
• Clikc near a corner, and the node will rotate 120° around it. 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.