This updates the 4.9 branch to support the latest LTS version of NodeJS (currently 14.x), allowing the same version to be used across all WordPress branches that receive security updates as a courtesy.
This also replaces the `npm-shrinkwrap.json` with a `package-lock.json` file. Lock files were not supported in earlier versions of NPM, but can now be used.
In addition to backporting the package updates that happened after branching 4.9, dependencies that were removed in future releases have also been updated to their latest versions.
Props desrosj, dd32, netweb, jorbin.
Merges [42460-42461,42463,42887,43320,43323,43977,44219,44233,44728,45321,45765,46404,46408-46409,47404,47867-47869,47872-47873,48705,49636,49933,49937,49939,50017,50126,50176,50185,50192] to the 4.9 branch.
See #52341.
git-svn-id: https://develop.svn.wordpress.org/branches/4.9@50202 602fd350-edb4-49c9-b593-d223f7449a82
JSON files don't need a particular indent style, this was just inherited from the jQuery `.editorconfig`, that we based ours on.
`package.json` is staying in the 2-space-indent group for now, due to npm 3 and 4 having issues. Upgrading to npm 5 will allow us to remove `package.json`, too.
Props netweb.
Fixes#40946.
git-svn-id: https://develop.svn.wordpress.org/trunk@41835 602fd350-edb4-49c9-b593-d223f7449a82
