release: watchexec-cli v1.24.0

[github-actions]

This is a release PR for watchexec-cli version 1.24.0 (performing a minor bump).

Use squash merge.

Upon merging, this will automatically create the tag v1.24.0, build the CLI, and create a GitHub release.
You will still need to manually publish the cargo crate:

$ git switch main
$ git pull
$ git switch --detach v1.24.0
$ cargo publish -p watchexec-cli

To trigger builds initially: either close and then immediately re-open this PR once, or push to the branch (perhaps with edits to the README.md or CHANGELOG.md!).

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Edit release notes into the section below:

Release notes

Software development often involves running the same commands over and over. Boring! Watchexec is a simple, standalone tool that watches a path and runs a command whenever it detects modifications. Install it today with cargo-binstall watchexec-cli, from the binaries below, find it in your favourite package manager, or build it from source with cargo install watchexec-cli.

In this release:

• New: start/stop messages are now in colour. Use --colour=never (--color also accepted) to disable, or the conventional always and auto. (An option to print a colored message when the command completes #144, Colour for failed exit messages and errors #237, Add --quiet, --timings, --colo[u]r, --bell #698)
• New: --timings to print how long the command took. (Print time elapsed after command is done #278, Add --quiet, --timings, --colo[u]r, --bell #698)
• New: --quiet to disable printing any message (except warning and error logs). (Add --quiet, --timings, --colo[u]r, --bell #698)
• New: --bell to ring the terminal bell on command end. (Terminal bell on command finish #238, Add --quiet, --timings, --colo[u]r, --bell #698)
• New: --ignore-nothing to switch on all the --no-*-ignore flags. (Flag for "don't ignore anything" #275, Help text and man page mention non-existent --ignore-nothing option #625, Add --ignore-nothing #695)
• New: --only-emit-events disables launching a command, and only prints events to stdout. Requires --emit-events-to to specify the format to print. This lets you obtain a stream of change events to handle directly rather than mediating via a command. (An option to launch without any process management #676, Add --only-emit-events #691)
• New: --map-signal to map signals received by Watchexec to other signals sent to the command. (Add option to send different signal to child on graceful exit (e.g. sending SIGTERM on SIGINT) #151, Pass SIGINT to spawned process #387, New option: --signal-map #710)
• Change: --emit-events-to stdin and json-stdin modes are renamed to stdio and json-stdio respectively; the old names are aliased to preserve compatibility.

Other changes:

• Uses the Watchexec library 3.0. (Breaking changes for watchexec lib #601)
• -w /dev/null disables watching any files. This is the literal string /dev/null, it won't detect the null device via links or fifos. (Breaking changes for watchexec lib #601)
• Running as PID1 (e.g. in Docker) is fully supported. (Support running as PID 1 #140, Breaking changes for watchexec lib #601, Audace crate #624)
• Performance improvements and bugfixes around reaping processes (via command-group 5). (Breaking changes for watchexec lib #601)
• Performance improvements and bugfixes around watching files (via notify 6). (Breaking changes for watchexec lib #601)
• Clear the screen before printing events, so --print-events and --clear can meaningfully be used together. (Breaking changes for watchexec lib #601)
• Hint that more or less help is available with long --help and short -h flags. (Breaking changes for watchexec lib #601)
• The PDF version of the manual page is gone, due to the tooling I used disappearing, and the general ugliness of its typesetting. (New option: --signal-map #710)

[passcod]

Todos remaining:

• watchexec/crates/cli/src/config.rs

  Lines 429 to 432 in 9af9189

  	fn available_powershell() -> String {
  	// TODO
  	todo!("figure out if powershell.exe is available, and use that, otherwise use pwsh.exe")
  	}

• --restart regression — nope, just misinterpreted read not stopping on sigterm/sigint
• --signal and --stop-{signal,timeout} works
• --on-busy-update=queue works
• test: --stdin-quit
• test: --shell and -n
• test: --env