This addresses the inclusion of some dev dependencies that should not
have been included, due to a bug in Arborist 1.x which has been
corrected.
It also just moves some stuff around that was still in the tree shape
that npm 6 created, which is different than what npm v7 will create.
Several formerly dev deps were moved to production dependencies due to
the addition of resolve in normalize-package-data v3.
This removes a lot of very outdated dependencies, updates many to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.
