Closes #1583

- Fix priority to match the commented behavior.
- Ignore bogus LOG_LEVEL values.

I managed to lose this deletion in a merge.

Closes #1320

Closes #1502

Closes #1465.

Closes #1530.

See #1532 for more context.

- Errored JSON requests will get back the error in JSON instead of using
  the status text. This seems better to me because it seems more correct
  to utilize the response body over hijacking the status text. The
  caller is expecting JSON anyway. Worst of all I never actually set the
  status text like I thought I did so it wasn't working to begin with.
- Allow the update error to propagate for JSON update requests. It was
  caught to show the error inline instead of an error page when using
  the update page but for JSON requests it meant there was no error and
  no error code so it looked like it succeeded.
- Make errors for failed requests to GitHub less incomprehensible.
  Previously they would just be the code which is no context at all.

Fixes #1535.

Fixes #1507.

Otherwise the request will just hang.

The raw value is now passed back to VS Code so it can do the parsing
with its own URI class rather than trying to parse using Node's url
module first since that has no guarantee of working the same way. It
also lets us keep the vscode-remote bit internal to VS Code.

Removed the logic that keeps trying paths until it finds a valid one
because it seems confusing to open a path and silently get some other
path instead of an error for the one you tried to open. Now it'll just
use exactly what you specified or fail trying.

Fixes #1488. The problem here was that url.parse was encoding the spaces
then the validation failed looking for a literal %20.

This makes the code much more internally consistent (providers just
return payloads, include the proxy provider).

There's no need to specially construct the path.

Otherwise they'll crash code-server.

This simplifies the logic a bit.

The cookie will be set for the proxy domain so it'll work for all of its
subdomains.

It'll be able to handle /proxy requests as well as subdomains.

This allows it to be used in subdomains.

This will be used for proxying ports.

- Add type to HTTP options.
- Fix certificate message always saying it was generated.
- Dedent output not directly related to the HTTP server.
- Remove unnecessary comma.

That way if they happen to conflict code-server doesn't crash.

This prevents Cloudflare's Rocket Loader from acting on them.

Fixes #1451.