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 #1507.

Otherwise the request will just hang.

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

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.

This will make it work regardless of what the current URL happens to be.

Also move the telemetry setting into the options since we might as well
make use of it seeing as how we have to parse it for the base path
anyway.

In Firefox using the gzip mime type will (probably correctly) cause it
not to decompress while in Chromium it still will (incorrectly).

To make installing as a PWA possible. Fixes #1181.

Also make it a number.

It still won't work behind a base path, but if you're using a reverse
proxy you can just redirect to HTTPS yourself. And should probably
handle TLS termination there too.

For sockets I just needed to add back the proxy call.

Just a login form and a list of applications. No modals or anything like
that.

Now it should work whether you have a trailing slash or not.

This is mostly for development where VS Code might not have finished
compiling yet.