[Feat] More info when expanding nodes.

[rossduncan]

Currently the visualiser displays too little information about nodes. Could we please add:

• The name of the task. In the main view, long names are truncated. Full name should be displayed in the details pane.
• Inputs and Outputs the names and types of the inputs and outputs; didn't we have this before?
• ** Value for inputs and outputs where the are available
• Executor / context for this node.