DevTools: Fully disable 0.14 support

[bvaughn]

It’s confusing that 0.14 or earlier is in half-working state where it displays a tree (but incorrectly). We should detect it and fully disable if it doesn’t work. Or fix it.

If we go the route of disabling support:

1. DevTools should show a warning message that clearly indicates the version of React isn't supported. (This is probably a good idea for v13 and older anyway.)
2. DevTools should not throw any errors.

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Originally reported by @gaearon via bvaughn/react-devtools-experimental#384

[danielhusar]

I can take a look if nobody started on this one yet :)

[bvaughn]

It's all yours @danielhusar. Please let me know if you decide not to work on it for any reason, and I'll remove the "taken" label 😄

[danielhusar]

@bvaughn Hey! Is there an easy way to get react version?
I'm looking into window.__REACT_DEVTOOLS_GLOBAL_HOOK__.renderers but looks like version has been only added in recent react versions. Or perhaps perform some feature detection?

It's also possible I'm looking into a totally wrong place :)

[bvaughn]

I think you would have to feature detect it. Here's how the legacy extension did it:
https://github.com/facebook/react-devtools/blob/d839081f79f681617df7584a8ffd2f4163fa40b9/backend/attachRenderer.js#L24-L76

Based on this, I think checking for renderer.ComponentTree should be a sufficient way of differentiating between v15 and older. (But you'd want to double check me by testing it.)