Remove unused dependencies.

• Modernize lazy_static API members into std::sync::LazyLock
• Follow more Rust conventions (&str, &[&str] for input types; String, Vec<String> for output types)

Align string replace templates and API documentation.

Internalize more regex logic, for ease of configuration.

• Improve accuracy by dividing pass/fail logic into two phases, using separate regexes for identifying formal tasks vs. general tasks.
• Implement basic todolint.toml configuration file system. When present in the current directory, this file supercedes default settings.
• Simplify default settings to primarily English idioms.
• Establish a richer set of integration test files in examples/ on a per-human-language basis.

The writing for non-English examples was initially obtained from Gemini for mechanical testing purposes, though of course we do not trust Gemini for localization.

Speakers are welcome to help refine our examples, as well as add more languages.

• Unified TODO nicknames across human languages into a common default regex
• Allow for exceptions of the form <status>: <uri>, as a way to provide meaningful context to longer term solutions
• Deepen unit and integration tests

Release archive includes precompiled binaries for a wide variety of platforms.