Drop the builtin category and move the missing variables to appropriate es* categories (#140)

[Standard8]

This implements what was outlined in #140. The only missing items in the es* categories were the BigInt related ones, and the globalThis.

I have put them in the es2017 section as that is the latest one there. I wasn't quite sure if that was right or not.

[Standard8]

Looking at the ESLint version of the configuration file, do we actually want a es2020 section now?

https://github.com/eslint/eslint/blob/fee6acbe13cecd4c028e681e185fc6a6d6ba9452/conf/environments.js#L35

[sindresorhus]

do we actually want a es2020 section now?

Yup

[nzakas]

I’d prefer not to drop builtin completely. It can be generated from the other categories to keep it in sync if that’s the concern. I think it’s valuable to keep as a collection of all globals.

[brettz9]

@Standard8 , is anything holding you back from moving the three BigInt* and globalThis to a new es2020 (and restoring the builtin section)?

[sindresorhus]

Closing for lack of response.

#140 (comment)