Badgen is a faster successor of shields.io:https://github.com/badgen/badgen.netBackport from `master`-branch.

Fixes the following error when running integration-tests:```npm ERR! code ERESOLVEnpm ERR! ERESOLVE unable to resolve dependency treenpm ERR!npm ERR! While resolving: webpack-test@1.0.0npm ERR! Found: handlebars@5.0.0-alpha.1npm ERR! node_modules/handlebarsnpm ERR!   dev handlebars@"file:../../.." from the root projectnpm ERR!npm ERR! Could not resolve dependency:npm ERR! peer handlebars@">= 1.3.0 < 5" from handlebars-loader@1.7.1npm ERR! node_modules/handlebars-loadernpm ERR!   dev handlebars-loader@"^1.7.1" from the root projectnpm ERR!```

As explained in issue#1844 and in issuewebpack/webpack#15007 (comment),the way we used the `browser`-field was wrong.The main reason for using the `browser`-field is the requirement of`require('fs')` in the main-entry-file.The workaround for this was using `require('handlebars/lib/handlebars')`,but now it will also work via `require('handlebars')` for bundlers thatrespect the `browser`-field.The `"./runtime"`-config was removed, because it didn't have any effect.In order to detect regressions, the webpack-integration test wasextended to test with different webpack versions.Fixes#1174Closes#1844

Fixes#1820Closes#1821

```npm ERR! `npm ci` can only install packages when your package.json and package-lock.json or npm-shrinkwrap.json are in sync. Please update your lock file with `npm install` before continuing.npm ERR!npm ERR! Invalid: lock file's acorn@5.7.4 does not satisfy acorn@7.4.1npm ERR! Missing: acorn@5.7.4 from lock file```

When using Handlebars in a Cloudflare Worker, an environmentin which the `window` and `global` objects both don't exist,an error is thrown about `window` being undefined.According to the ECMA specification, only `self` is availablein a worker. Since we support old runtimes in our 4.x branch,we can't use `globalThis` but have to use a polyfill.

* Replaced outdated `grunt-bg-shell`-package to get rid of  coffee-script warningsBackports parts of785a63e.

In order to automate publishing 4.x releases to AWS S3,we also need this workflow on the 4.x branch.See#1972

When visiting the www-variant, a `SSL_ERROR_INTERNAL_ERROR_ALERT`error is displayed by the browser.

This commit backports changes from `master`.

Fixes#1838