Upgrade to Babel 7 (#1595)

* Upgrade to Babel 7

* Update dependencies

* Remove `modules` and `useEsModules` as module support is automatically detected

Target browsers supporting ESM in the ESM build.

* Disable corejs aliasing (polyfill)

* Fix package.json and update lockfile

* Bump CircleCI cache version

* Remove `Object.values()` use for Node 6 compatability

* Remove redundant arguments to @babel/register

* Update rollup and rollup-plugin-babel

* Add ignore option to no-transform-runtime-aliasing

Ignore JSON.stringify, parseInt, and ParseFloat

* Upgrade babel-loader to 8.0.1

* Use api.env() in Babel configuration

* Upgrade babel-loader to 8.0.2

babel.config.js

@@ -0,0 +1,25 @@
+module.exports = api => {
+    const isESMBuild = api.env("esm");
+
+    const presets = [
+        ["@babel/env", {
+            targets: {
+                esmodules: isESMBuild,
+            },
+            loose: true,
+        }],
+        "@babel/flow",
+    ];
+    const plugins = [
+        "@babel/transform-runtime",
+        ["@babel/proposal-class-properties", {
+            loose: true,
+        }],
+        "version-inline",
+    ];
+
+    return {
+        presets,
+        plugins,
+    };
+};