Consider allowing Node to store model data

[Vasanth Velusamy]

If Node can also store model data, then subsequently, it gets easier to access the model when an action is performed on the node (such as tap, double tap).

For example:

‌

Node node = Node(
  label: ...
  key: ...
  ...
  data: <custom data model object>
)

...
onNodeDoubleTap: (String key) {
   Node selectedNode = _treeViewController.getNode(key);
   MyModel selectedModel = selectedNode.data;
}

Nice widget, by the way.

[Kevin Armstrong]

Thanks Vansanth. I like that idea. That should be easy enough to implement. Give me a day or so to implement it and test it out.

[Kevin Armstrong]

Fixes issue #3. Added generic data property to Node class to support the use of custom data

Updated node_test Updated documentation

→ <<cset 2ca91f5bb2c5>>

[Vasanth Velusamy]

That was fast! Works as expected. Thanks!