dillon1000/react

Break out some Class Component logic into separate module

Refactors the class logic a bit.

I moved scheduleUpdate out into the scheduler since that's where
the scheduling normally happens. I also moved it so that we can
rely on hoisting to resolve the cycle statically.

I moved the updater to a new class component file. I suspect we
will need a bit of space in here since the class initialization
code is quite complex.

The class component dependency is currently fixed in BeginWork
so we can't move complete or commit phase stuff to it. If we need
to, we have to initialize it in the scheduler and pass it to the
other phases.