🆕 🎓 Topic16 Aside on spliterator

[jameshughes89]

Related Issues or PRs

As mentioned in #190

What

As @twentylemon suggests in #190, add an aside for spliterator which discusses (a) streams, (b) parallel, and (c) a tad functional stuff in high level.

Why

Although these topics are well out of scope for a first year course, being exposed to these important ideas early is only going to be a good thing. I also am a fan of including bigger picture ideas too so students can get a sense of where things will/can go.

Where

Topic 16 on iterators. If the point is streams, parallel, and functional programming, this may seem off, but iterator -> spliterator -> these ideas is a great segue.

[jameshughes89]

The more I think on this, the more I want to make sure I talk not only about functional, but hit, at at an exceptionally high level, lambda calculus.