Set node lifeteme

[PawelRoman]

When adding a node to scene I should have ability to set a lifetime of this node, after that time elapsed the node should autodelete and be removed from scene.

Also it would be super useful if I had a way to know that deletion is happening (so I can react and do something extra)

Very useful for scenarios like:

• explosions
• flying debris (which disappear after 2 seconds, and show small animation when they disappear)
• etc.