Also, modernize the code in the unsupported version checking module.

Allows openUrl to open `file://` urls, and passes that instead of the
raw path.

We don't use that any more, Arborist handles it all for us.

- Several sections of code moved out into separate modules.
- npm is an instance of an inline class.
- uses a Proxy for npm.commands object instead of the old hand-rolled
  Proxy-esque thing.
- organized code path for outputting usage/help information.

This removes a lot of very outdated dependencies, updates many to
their modern (usually promisified) versions, and updates (or removes)
code to account for the change.

Several dependencies have been completely removed, and others a bit
shuffled around, so that the node_modules folder can be bundled somewhat
more optimally than it would have otherwise.

This module is only used via arborist and npm-pick-manifest

It was a mistake to have a command alias that sets a config.

Reinstall everything from a clean node_modules and package-lock.json
state.

Re-generate list of bundleDependencies and node_modules/.gitignore with
a script that does the right thing based on actual dependency state.

The functions are different actual things because only one of them is
loaded in the NYC transpiled coverage environment.

Way too opinionated and hard to configure.  Copied out standard's config
as a starting point, and tweaked a few things that don't make sense for
the npm cli project.

First self-install!

This resets the node_modules tree state after fixing the bug in
minipass-pipeline that caused some tarballs to be incompletely unpacked.