extract-files 4.0.0 on Node.js NPM

Major

extractFiles is a named export again, and there is no longer a default export; mixed named and default exports causes native ESM and CJS interoperability issues.
isObject is no longer exported. It was not a documented API anyway.
Removed the ReactNativeFile static function list. It added surface area to the API and bundles and is simple to do manually.

Updated Babel, removing the @babel/runtime dependency.
Refactored package scripts to use prepare to support installation via Git (e.g. npm install jaydenseric/extract-files).
Package marked side-effect free for bundlers and tree-shaking.

Use jsdoc-md to generate readme API docs from source JSDoc, which has been much improved.
Use tap instead of ava. Tests no longer transpile on the fly, are faster and AVA no longer dictates the Babel version.
Tests run against the actual dist .mjs and .js files in both native ESM (--experimental-modules) and CJS environments.
Added a package test:size script, using size-limit to guarantee < 500 byte ESM and CJS bundle sizes.
Removed the package clean script rimraf dev dependency in favour of native rm -rf.
Removed the package fix script.
Renamed the MODULE environment variable to BABEL_ESM to be more specific for the package prepare:mjs script.
Lint .json, .yml and .md files.
Use .prettierignore to leave package.json formatting to npm.
Use eslint-config-env.
Compact package repository field.
Updated package description.
HTTPS package author URL.
Added package keywords.
Replaced shields.io readme badges with:
- A Badgen npm version badge.
- An official Travis badge that only tracks master branch.
Changelog version entries now have “Major”, “Minor” and “Patch” subheadings.