Manages custom nodes for the Visual Script editor.
This singleton can be used to manage (i.e., add or remove) custom nodes for the Visual Script editor.
custom_nodes_updated ( )
Emitted when a custom Visual Script node is added or removed.
Add a custom Visual Script node to the editor. It'll be placed under "Custom Nodes" with the
category as the parameter.
Remove a custom Visual Script node from the editor. Custom nodes already placed on scripts won't be removed.