dillon1000/react

Transfer everything from Element onto the Fiber

This has a few benefits:

1) This allows the element to always remain on the young generation.
2) The key can be accessed on the fiber which is easier to keep as the
same class and is directly accessible in the child reconciliation of every
object.
3) This conveniently means that we don't have to create a fake element for
continuations which was really hacky.

We can still do the quick bailout of rerendered things using the props
object which is also unique.