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Babel 7 (#2324)

Babel 7 was recently released so I gave a shot at upgrading it. Followed the advice from the official upgrade guide [here](https://babeljs.io/docs/en/v7-migration). Also, stage presets were removed so I used [babel-upgrade](https://github.com/babel/babel-upgrade) to make sure we had the relevant plugins for stage 0 (as we had until now).

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