Add examples

[uruuru]

I'll use this ticket to keep track of examples I'd like to add. As such I'll simply edit the description without closing the issue. Feel free to do the same.

layered

• usage of baseValue spacing
• usage of (new) portLabels.placement

rectpacking

• the various forms of interactivity

[soerendomroes]

Where do you want to add the example files for interactivity?
Note: Since interactive layout needs two layout runs to work properly it will not work in elk live I presume.

[uruuru]

I guess somewhere below "user-hints". Whatever makes sense.

If you specify positions in the elkt file (i.e. the result of a fully automatic layout run), you may be able to work around the necessity of two layout runs.