Summary:
When trying to run some React component performance profiles, the updates registered made absolutely no sense (components rerendering without any parent or other cause causing them to render etc). That turned out to be caused by having an outdated version of the React devTools in Flipper.
Sadly the newer version of the React DevTools didn't work with our current Electron version anymore. Some horrible hacking is needed to work around that.
To help with updating the tools in the future (they are by default cached forever on the local machine), I've introduced the `FLIPPER_UPDATE_DEV_TOOLS` variable.
The plugin loading work around is inspired by https://github.com/electron/electron/issues/23662#issuecomment-787420799
Reviewed By: passy
Differential Revision: D27685981
fbshipit-source-id: c35e49aff9b2457b63122eeee0d5c042ddd3b08b
e29222fba7