Leave compression up to people's own custom build setups

Closes #5127

Issue #5037

The kludge of pulling files from github no longer works now
that we have a build process, and since most people have their
own build pipeline now, I don't feel that supporting on-website
builds is that important anymore.

Issue #3976

Closes #3322

(Blint is the in-tree tool factored into its own npm package.)

Bumping them for every release just adds too much git
noise and history blowup.

Mode dependencies are now loaded in a saner way.

Does all the version bumping and such.

Node provides some cross-platform utility methods to enable safe
path traversal.

This change merely swaps out a hardcoded '/' (unix path separator)
to use one of these methods.

An alternative strategy would be to use the constant 'path.sep' but
this felt 'cleaner'.

Signed-off-by: ciaranj <ciaranj@gmail.com>

And a script to update it from the git data.

Closes #1510

Closes #1133