autolayout animate node position

[forresto]

From a friend that read the Kickstarter update:

are you gonna have a little animation that shows the graph moving to the new layout? just a half-second thing. cos if you're watching, and you have a feel for where the components are, your brain will register the new locations and you won't have to look for em.

Now that we can animate component state (#165 thanks to @djdeath) we should look at animating nodes on autolayout. This kind of animation will help visualize what is moving where.

Also useful for

• collaboration, when somebody else is moving a node
• journal undo / redo

This is a little complicated because edges will need to be animated as well, so it will need to happen at the-graph-graph level.

[forresto]

This should probably wait until I abstract out a new "store" for all of the state (#176). Now we're a little too tied to the noflo.Graph.

[automata]

:+1: