First cut of behavioural definition

state.json

{
  "name": "State",
  "properties": [
    "name",
    "recurrent",
    "w",
    "h"
  ],
  "behavior": {
    "tick" : {
      "w" : "Math.cos(currentTime)*100",
      "h" : "Math.sin(currentTime)*100"
    }
  },
  "label": {
    "for": [
      "name"
    ],
    "color": "green",
    "placement": "internal",
    "length": 15,
    "pattern": "{0}"
  },
  "elements": [
    {
      "figure": "rounded",
      "size": {
        "width": "${w}",
        "height": "${h}"
      },
      "fillColor": "${recurrent}",
      "borderColor": "black",
      "x": "${w}",
      "y": 0,
      "borderRadius": 10,
      "strokeColor": "black"
    }
  ]
}