Remove face4

[brason]

This removes all use of Face4, replaces UV with Vector2, adds RingGeometry, as well as updates some examples and adds a new one.

[brason]

/ping @johsin18 :)

[nelsonsilva]

Thanks @brason
Looks like you did a lot of work ;)
Unfortunately I'd say there's too much going on for a single PR which makes it difficult to you review.
Can you break it down into smaller PRs with some more context info about the updates/new features (at least why they're something we want/need) ?
I'd say we're looking at at least four PRs: updates and cleanups, adding RingGeometry + samples, replacing UV with Vector 2 and removing Face4.
You can create a new branch from master, cherry pick some commits and push them to a new branch to open a new, smaller PR.

[brason]

I feared you might say that :) I will get to it soon.