Fixes #1076.

Partly addresses #1121.

This fixes code-server exiting with zero on errors.

See #1109.

Fixes #1101.

Fixes #1062.

Also too the opportunity to rewrite the build script since there was a
change in the build steps (mainly how the product JSON is inserted) and
to get the build changes out of the patch. It also no longer relies on
external caching (we'll want to do this within CI instead).

To ensure users don't lose their extensions when updating.

Fixes #911.

This allows piping to things like `head` without SIGPIPE errors.

- Implement the localization service.
- Use the proper build process which generates the require JSON files.
- Implement getting the locale and language configuration.

This means that you have to turn on features now instead of disabling
them like auth and https.

In addition:
- Allow multiple options for auth (only password for now).
- Combine the install docs since they had many commonalities and
- generally simplified them (hopefully not too much).
- Move all example configs into docs/examples.

It's only used for the login redirect.