feat(project): implement the new manual Babel polyfill

[homer0]

What does this PR do?

This is the implementation of homer0/projext#77.

The package @babel/polyfill has been deprecated in favor of using core-js and regenerator-runtime directly

The project now requires core-js, regenerator-runtime and adds a custom polyfill file that imports them, following the recommandation of @babel/polyfill's deprecation note.

This is breaking beause WebpackConfiguration now requires webpackPluginInfo in order to create the path to the "polyfill" file.

How should it be tested manually?

In order to test this, you need to install homer0/projext#next and make sure you delete the copy of projext npm/yarn will install inside this package's node_modules.

Then run/build your target with babel.polyfill set to true, you should have the new polyfills in place.

Also, don't forget...

yarn test
# or
npm test

[coveralls]

Pull Request Test Coverage Report for Build 261

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 258:	0.0%
Covered Lines:	605
Relevant Lines:	605

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💛 - Coveralls