Created by: Durman
Addressed problem description
This PR should bring life into group nodes. It's not a final stage and future updates can break work of saved trees with group nodes. For now every node which connected to group output node or to other nodes which connected to group output node will be evaluated. Also Debug print and Stethoscope nodes are supported.
Editing the same node groups from different windows is unsupported. Viewer nodes inside ndoe groups are not supported.
fixing #3660 (closed) #3319 (closed)
Preflight checklist
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Ready for merge.