nodeeditor
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Added duplicate selection (CTRL+D), undo and redo (CTRL+Z/Y) with scene history.
My laptop is in repair and I was busy with our small baby last weeks. I will come back to it as soon as I can.
Thanks Dmitry
This pull request has a plenty of unrelated features. Some of them seemed to be half-baked.
Nevertheless, I took some coding samples from this work and implemented an Undo/Redo system and a Ctrl+D node duplication mechanism.
I'll continlue looking through the code to take more features for master