* Part of https://github.com/zed-industries/community/issues/70

Allows to fully remove from Zed certain files or file groups: no items
will be scanned or added into worktrees, so nothing will be shown in
project tree, project search and go to file would not see those,
corresponding FS events will be ignored.

One exclusion is .git files: those are still not shown or accessible by
default, yet tracked in the worktrees.

By default, is configured to 
```json
  "file_scan_exclusions": [
    "**/.git",
    "**/.svn",
    "**/.hg",
    "**/CVS",
    "**/.DS_Store",
    "**/Thumbs.db",
    "**/.classpath",
    "**/.settings"
  ],
```

* In addition, contains code preparations for "search in included files"
feature: new SearchOptions variant, search crate and RPC adjustments

Release Notes:

- Added `file_scan_exclusions` section to project settings to completely
ignore certain files in Zed

Made the trait into a blanket-trait impl if you have it's two
constituent pieces (FocusableView and EventEmitter) to remove the
duplicated method. I also changed the struct to an enum for aesthetic
reasons (EventType::EventName feels self documenting to me) and added
some new `cx` APIs utilizing our new powers of dismissal.

Release Notes:

- N/A

- Fix image errors


Release Notes:

- N/A

* Firstly only log one error per image load, not per frame
* Secondly use an Icon not an image for rendering Icons

* Clickable context menus & movable panels – what will they think of
next?!

Release Notes:

- N/A

Do not descend into ignored directories, to avoid tracking their state.

I accidentally left the test assertions unnecessarily vague in
https://github.com/zed-industries/zed/pull/3348. This PR makes the
assertions constrain the behavior more specifically. I also added a
second test for a related bug that was fixed in that PR, about
performing and undoing an edit while a buffer reload is in-progress.

Release Notes:

- NA

Ensure actions are registed just once (previously some were registered on both Workspace and search bar itself).

Get rid of the following warnings:

```
The example target `test_app` in package `live_kit_client2 v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client2)` has the same output filename as the example target `test_app` in package `live_kit_client v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client)`.
Colliding filename is: /Users/someonetoignore/work/zed/zed/target/debug/examples/test_app
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
warning: output filename collision.
The example target `test_app` in package `live_kit_client2 v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client2)` has the same output filename as the example target `test_app` in package `live_kit_client v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client)`.
Colliding filename is: /Users/someonetoignore/work/zed/zed/target/debug/examples/test_app.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.

---------------

warning: output filename collision.
The bin target `Zed` in package `zed2 v0.109.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/zed2)` has the same output filename as the bin target `Zed` in package `zed v0.113.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/zed)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/Zed.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
```

as we plant to build *.dmg of both versions for a while.

Release Notes:

- N/A