remove 3rd party react components

[jbalsas]

No description provided.

[jbalsas]

Hey @ipeychev, could you double-check this before I merge?

We've done here the bare-minimum, keeping v0.14.2 as our bundled version of React and just applying the necessary changes so that the *-no-react version of AlloyEditor works when overlayed on top of a React@16 distribution.

With this, we avoid any breakage or unexpected behaviour changes. This is in a big part driven by our current build process which makes adopting newer versions of React a bit more cumbersome than expected. We plan to address this soon after we release 1.5.0 with an in-depth refactor of how modules are written and bundled so we can release a 2.0.0 bundling React16.

Please, let us know what you think. Hope that makes sense!

[ipeychev]

👍 from me and congratulations to @vbence86 for the great job on that!