Remove dependency on React

[davetapley]

Great idea for a library @k-ode, but are you open to removing dependency on React?

See also: https://github.com/ryansolid/mobx-jsx

[k-ode]

@davetapley Yes, this is a long term goal of this library. Do you want to use it with mobx-jsx? Would be great to have concrete use case to test against.

[davetapley]

We have a moderately large React codebase which I'm slowly replacing parts of with MST.
Probably a few years ago, and just scoping out viable replacements.