Get all nodes recursively

[me2beats]

Tip-trick:
A simple method to get all nodes recursively, starting from a root node (specified as an argument).

static func get_nodes(node:Node)->Array:
	var nodes = []
	var stack = [node]
	while stack:
		var n = stack.pop_back()
		nodes.push_back(n)
		stack.append_array(n.get_children())
	return nodes