changed to startNode file to be a general file for custom node types, and created a custom type for the data property of StartNode. BREAKING: renamed StartNode.tsx to NodeDefinitions.tsx ref: N25B-114
changed to startNode file to be a general file for custom node types, and created a custom type for the data property of StartNode. BREAKING: renamed StartNode.tsx to NodeDefinitions.tsx ref: N25B-114