[NodeCanvas] Small memory allocation when changing the active subgraph

[leanon00]

Hello! Hope this can be fixed.

I found a memory allocation when changing the active subgraph in a very common usage pattern
this allocates memory because of the lambda variables scope capture.

Attached the stack trace from a deep profiling in unity where it allocates 160 B for every sub tree change.

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[Gavalakis]

Hello!

You are right. I plan to do another review of everything soon (something I typically do once in a while to refactor things), and will fix this 🙂

Thank you.

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