Preview Panel

[mck]

We should be able to create additional previews tied to panels that can be used to visualize more complex nodes. These nodes are likely to be used purely to hook into the editor.

We will need to

1. Define the new nodes.
2. Create specific controls to add the trigger preview visualization either directly on the node or in the editor input/output panels
3. Define panels that tie into the Editor that can be loaded async to load complex visualizations

There is a useOpenPanel that can be used to open panels in the editor . Use the ID of the node as the window ID