Events on threejs scene + edit from config.pixel folders

[Bono974]

Hi @anvaka,

I'm using ngraph.pixel (after vivagraphjs) to render some RDF graphs, and I'm really impressed by what you've done !
It works great for my current needs, but I would suggest some new events / ways to edit a graph.
So many questions about differents modules, but I hope I'm in the right place.

Events

• I know context menus are currently only supported by Firefox, but it would be a great improvement if we can catch a 'right click' event and be able to show some inputs.
• I didn't found how to catch a 'click' event from the scene.
  On your config example, we can click on a node, but if I click on the threejs scene just after, I wish it could clear the 'Current Node's folder.
• Do you think it's possible to add an area selection like the vivagraphjs 'one, even if it's with the 2D layout ?

Config.pixel

I've added many folders into the config.pixel to see some node's metadata from a SPARQL query.

• I didn't found how to add a submit button. It would be great to edit the text inputs and fire a callback.
• Again, I didn't found how to add a input into a folder. RDF I saw somewhere that if we want to catch your attention, we may propose you to do something like impossible or nearly impossible to do. You may know that a RDF graph isn't really a 'graph' but like a 'property graph' with many properties/links between 2 entities/nodes. What do you think of a ngraph module to do something like that ? Cheers, Bruno