Feature/interaction

Created by: bartwesselink

Added interaction. node.selected is added to determine which node was selected. For now I quickly added it to the existing visualizations, but it is up to the creators of the visualization on how to implement this.

For now, I disabled zooming to node. It appears that the translation is not in the center, and I cannot yet find out why this is. I created this PR anyway because besides that, I believe it is ready to be tested :)