Add initial support for opening files / folders in running code-server instance.

Current limitations:

- unable to open a file in a new window, only folders
- unable to use addMode feature
- others...

systemd's user units are buggy on certain versions
and do not linger by default.

Closes #1771
Closes #1673
Closes #1882
Closes #1861

systemd's user units are buggy on certain versions
and do not linger by default.

Closes #1771
Closes #1673
Closes #1882
Closes #1861

Update dependencies in package.json

We need the handler to be recognized as a PWA but we can just let the
original offline browser message show instead of our own message.

See #1925 and #1979.

Co-authored-by: Ngiddyuptiger <65830808+giddyuptiger@users.noreply.github.com>

See #1898 and #1905

There is no python package anymore, you have to explicitly
pick which version of python to install and we need to inform
npm of the executable name.

This reverts commit 6539dd4d.

Breaks linting and wasn't required.

Much easier for users to use our CI scripts instead of each individual
yarn step.

I'm surprised no one has asked any questions about this.

See #1894
See #1892
See #1810

tsc doesn't check if the output exists when incremental is true.

i.e if I delete the out directory, but keep the tsbuildinfo and
try to rebuild, nothing happens cause it thinks everything is
up to date I guess...

With this change, yarn clean will now remove the tsbuildinfo correctly
so things work as expected.

Otherwise the build keeps failing for me as tsc won't compile anymore.

Not sure why things work on CI/for asher but I don't think this will
cause any additional issues.

* Document release branches

* Update doc/CONTRIBUTING.md
Co-authored-by: NAsher <ash@coder.com>
Co-authored-by: NAsher <ash@coder.com>

* instanceIp --> username@instanceIp

* [user]@<instance-ip>
Co-authored-by: NAnmol Sethi <hi@nhooyr.io>
Co-authored-by: NAnmol Sethi <hi@nhooyr.io>

qol changes

This mimics a recent change in VS Code's help. See #1965.

Mostly to match everything else.

Mostly so the base URL resolution code can be shared.

To help debug login issues.

Add plugin system for adding http endpoints

Add Callback type

Adds a reusable Callback type that is applied to emitter.ts for improved
readability/simplicity.

Update common/util::plural

Adds a str param to common/util::plural for pluralizing a string.
Applies plural to entry.ts.