Node 25 removes `SlowBuffer`, which is required by one of `vsce`'s dependencies.

CTRL+C only copies when text is selected. Otherwise it sends the standard SIGKILL.

Consistency is valuable!!

Includes reorganizing a lot of the theming configuration to group things more meaningfully.

And adds more specific Ruby settings into those updated groups.

The VS Code command "Developer: Generate Color Theme
From Current Settings" creates a JSON theme file based on the
current settings in the IDE.

Running that export, then copying in my semantic styles, yields
a perfectly accurate theme! Hooray for no more hand wringing!

Direct copy of the relevant settigns from my user `settings.json`
to the VS Code Color Theme.

Many of the items don't work as expected, but I'll clean those up
over the next several commits.

Code samples will make it much easier to validate that the
theme looks correct across as many languages as possible.

Thanks to the many theme designers before me whose work
created this initial collection (see demo/LICENSE)