Function breadthFirst

breadthFirst<T>(root, depth?): IterableIterator<TraversableTree<T>>
Iterates over the children of root, breadth-first

Other iteration options:
- breadthFirst: Children, breadth-first
- depthFirst: Children, depth-first
- parents: Chain of parents, starting with immediate parent
- siblings: Nodes with same parent
Type Parameters
- T
Parameters
- root: TraversableTree<T>
  Root node
- depth: number = Number.MAX_SAFE_INTEGER
  How many levels to traverse
Returns IterableIterator<TraversableTree<T>>