INV: Visual graph editor

[cpelley]

Exploring the use of a visual graph editor. In this case, my exploration of using litegraph.js

Takeaway

live editing:

• Being able to inherit properties between nodes means not having to redefine them on each node (hence leadtimes being passed between nodes).
• Defining complex relationships between properties of nodes is symbolised by this "DoSomething" associated with an edge. This would take the source and target node as input and define a relation between them.
• Global variables could be defined, like the "Cylce2Leadtime lookup" where these appear in the drop-down of fields, not requiring explicit connections to such globals. This could minimise the number of connections within a visual graph.

litegraph.js:

• Easy enough to put together custom node types.
• I edge behaviour would have to also defined and represented using nodes.
• No support for subgraphs within subgraphs (only 1 layer).

Example usage of litegraph.js:
https://gist.github.com/cpelley/3d1bd78ef61d48b61b164748b944773d