Use tabs for indentation in `package.json`

[netweb]

Tabbed indentation is now supported by npm 5.x for package.json, package-lock.json and npm-shrinkwrap.json files via: ​http://blog.npmjs.org/post/161081169345/v500 - npm v5.0.0

Indentation is now detected and preserved for package.json, package-lock.json, and npm-shrinkwrap.json. If the package lock is missing, it will default to package.json’s current indentation.

As part of #35105 (updated patch pending) for WP 5.0 the npm and Node.js versions will be bumped to npm 5.x and Node.js 8.x LTS respectively as the official supported versions for WordPress' build tools.

This change to the indentation of npm files further simplifies WordPress' codebase to use tabs for indentation in files where possible.

[dd32]

In 42460:

Build: Switch package.json to using tabs for indents.

Props netweb.
Fixes #43075.

[netweb]

Reopening to backport this change to the 5.0 branch. Primarily to remove any ambiguity of Core's JSON coding standards., currently, Gutenberg uses tabs for indentation but the 5.0 branch of core does not.

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Replying to swissspidy: ticket:45088#comment:4

When running npm install on my Mac, I see lots of changes of http URLs to https in package-lock.json. Is that happening for anyone else?

This patch can also update instances of http://registry.npmjs.org to https://registry.npmjs.orgthat currently exist in the 5.0 branch of the package-lock.json file.

[pento]

In 43782:

Build: Switch package.json to using tabs for indents.

Merges [42460] to the 5.0 branch.

Props netweb.
Fixes #43075.