Support "pinching" to form "is a" edges

[AleksLitynski]

There is no way to go from "conceptual room" to "a room" currently. I will make it possible to generate an "is a" edge from a new node. When the new node is interrogated, it will look up it's "is a" chain to find answers, then copy them to it's own nodes.

The parent must store all inter-changable values ("Blue | Red") as a range of values that the child may select between.

This will not cover "has" relationships, now how we will choose how many of something is had.

[AleksLitynski]

You can now pinch a node to form an "is a" chain.

You cannot yet look up the "is a" chain to find valid values based on ranges/edge weights.

[AleksLitynski]

I'm making a separate issue for support traversal by node weights.