This rewrites and simplifies the git status system by attaching the git
status to each individual entry. This also improves the git testing
infrastructure to cover more cases and be more accurate to how file
events actually occur. This also fixes several other bugs in the worktree and the buffer, and stops any randomly generated actions from happening inside a `.git` folder. Hopefully, we can undo this change soon once our randomized testing is more robust.

Release Notes:

- Will require a DB migration

TODO:
- [x] Pass randomized tests
- [x] Get ready for merging

co-authored-by: Max <max@zed.dev>

Closes
https://linear.app/zed-industries/issue/Z-2209/popovers-dont-always-have-syntax-highlighted-code
Closes
https://linear.app/zed-industries/issue/Z-2206/highlight-syntax-in-hover-docs

* Fix a ton of errors in our logs due to us not recognizing that
`elixir-ls` does not support code actions.
* Syntax-highlight elixir code blocks in hover popovers

The elixir LSP does not include a language name on its elixir code blocks.

- Added ThemeConfig
- Updated themes use ThemeConfig
- Refactoring
- Fixed TypeScript errors

Release Notes:
- N/A (No public facing changes)

Fixes Z-1618. In the current state, this only works for line comments
such as `//` (and whatever's set in `{language}.toml` as a
line_comment).

Release Notes:

- Comments are now extended on new line.

This pull request introduces a new assistant panel to Zed that lets
users interact with OpenAI using their API key:

![CleanShot 2023-06-07 at 09 39
10@2x](https://github.com/zed-industries/zed/assets/482957/ba2a5830-9aeb-4c45-a182-a44d6a72675f)

After setting the key up, it will be saved to the keychain and
automatically loaded the next time the assistant panel is opened. The
key can be reset using `assistant: reset key`.

![CleanShot 2023-06-07 at 09 39
23@2x](https://github.com/zed-industries/zed/assets/482957/a6808bb0-0098-45ae-a2e3-f4d88472e626)

From there, users can type messages in a multi-buffer and hit
`cmd-enter` (`assistant: assist`) to stream assistant responses using
the OpenAI API. Responses can be canceled by hitting `escape`.

![CleanShot 2023-06-07 at 09 40
16@2x](https://github.com/zed-industries/zed/assets/482957/749779da-850e-4ad5-af04-74a3ca39f7ad)

Users can quote a selection from the active editor by hitting `cmd->`
(`assistant: quote selection`), which will embed the selected piece of
text in a Markdown fenced code block. Conversations with the assistant
are ephemeral at the moment, but can be easily copy/pasted:

![CleanShot 2023-06-07 at 09 50
33@2x](https://github.com/zed-industries/zed/assets/482957/b3386c10-4c51-4419-a0e0-517112ef6521)

Release Notes:

- Added a new assistant panel feature that enables interacting with
OpenAI using an API key. This replaces the previous experimental `ai:
assist` command that would work on any buffer. The experience is similar
to the one offered by ChatGPT with the added ability to edit, delete or
enhance previous messages. When hitting `cmd-enter`, the assistant will
start streaming responses from OpenAI. A response stream can be canceled
using `escape`. Moreover, the active editor's selection can be quoted in
the assistant panel using `cmd->`, which will automatically embed the
selected piece of text in a Markdown fenced code block.

Fixes
https://linear.app/zed-industries/issue/Z-2208/outline-view-doesnt-differentiate-between-overloaded-functions
Fixes
https://linear.app/zed-industries/issue/Z-2205/elixir-syntax-highlighting-not-working-properly-for-doc-attributes-and

This PR improves syntax highlighting and outline view in Elixir. It's
common to overload elixir functions, with many different versions of the
function for different patterns of parameters, so I updated the outline
view to show functions' parameters in Elixir. But if we showed functions
the same way in the *breadcrumbs*, it would take up too much space.

So I added a new capture in languages' `outline` queries called
`@context.extra`, which is included in the outline view, but not in
breadcrumbs.

Release Notes:

- Improved syntax highlighting of doc attributes and special macros in
Elixir
- Updated the outline view in Elixir to display function parameters, to
allow differentiating between function overloads.

Introduce a new capture in the outline query called 'context.extra', which
causes text to appear in the outline, but not in the breadcrumbs.

### Before

![Screen Shot 2023-06-06 at 2 32 46
PM](https://github.com/zed-industries/zed/assets/326587/036f1da3-19c6-4979-adc6-c3133f8d63dc)

### After

![Screen Shot 2023-06-06 at 2 32 08
PM](https://github.com/zed-industries/zed/assets/326587/6d4729db-b76a-4052-847e-fd9de346f194)

Release Notes:

* Improved the syntax highlighting of fenced code blocks in markdown.

This time I've added a `components` section to rust-toolchain.toml file
to explicitly require a rustfmt component. Fingers crossed.