Formdata

[isocroft]

This PR enables the FormData constructor and instance APIs (e.g. set(), keys(), entries() ) using a polyfill located here

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[JakeChampion]

Thanks for the PR @isocroft.

This currently does not use/install the polyfill. To install the polyfill we need to declare it like this:

Suggested change

	opera = "<15"
	opera = "<15"
	[install]
	module = "formdata-polyfill"
	paths = [ "formdata.min.js" ]

We will also need to add it as a dependency to the package.json file by running npm i formdata-polyfill and updating the .gitignore and .eslintignore files to include polyfills/FormData/polyfill.js.

We also want to add some tests in polyfills/FormData/tests.js to prove the polyfill works correctly in all the browsers.

[JakeChampion]

Closing this in favour of #668 where the conversation and work seems to be progressing