Allow to configure different attribute visualizations for different node types

[alexsb]

When we have different node types in the NL view, we need to be able to individually specify the attributes that we want to show.

This will have implications for the UI to specify the attribute visualizations.

We probably want tabs for each node type with the config options.

When the nodes are laid out by attributes, we should generate two separate spaces for each type, and lay out independently in those.