Figure out how multi-selection will work

[afomi]

As a User,
I need to draw a link between two nodes
Somehow in the interface
One way to do this is by selecting both nodes
then clicking a button to draw a node.

Another idea: click on Object, hold a button, which institutes a ghost-drag, which would draw the link when you drag your mouse to the desired node to link.

Open to implementations. I think Raycasting is a fancy way to approach this, but maybe not necessary early on.