Add temporary connection - like a normal connection but between a node and a point in space

[monomon]

The purpose of this type of connection is to visualize where the edge is being dragged to while it is being dragged. I will post test code for this later, which demonstrates how to use it.

[strathausen]

I'll give it a try soon!

[strathausen]

Hey I looked through the changes and they look interesting. I'd be interested in some code on how to use it in order to better understand the use case of this feature. Thanks for taking the time and sorry it takes me so long to review, I'm very busy with work :-)