Modernize clap from 2.27.0 to 4.5 with derive API

[bpblanken]

Replace the old clap_app! macro with the modern derive-based approach. This simplifies the CLI definition, improves maintainability, and brings the dependency up to date. The functionality remains unchanged but the code is now more idiomatic and easier to extend.

[gemini-code-assist]

Code Review

This pull request updates the clap dependency to version 4.5 and refactors the CLI argument parsing in src/main.rs to use the modern derive API instead of the deprecated clap_app! macro. Feedback on the changes suggests improving CLI usability by adding long flags (--echtvar and --include) to the optional arguments, and simplifying the Args struct attributes by removing the redundant long_about = None attribute.

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[Copilot]

Pull request overview

This PR modernizes the CLI layer by upgrading from clap v2’s clap_app! macro to clap v4.5’s derive-based API, aiming to keep the CLI behavior the same while making the command definition more maintainable.

Changes:

• Replaced the clap_app! macro-based CLI definition with #[derive(Parser)] / #[derive(Subcommand)].
• Updated Cargo.toml to use clap = 4.5 with the derive feature.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/main.rs	Migrates CLI parsing to clap v4 derive structs/enums and updates dispatch to subcommand handlers.
Cargo.toml	Updates the clap dependency to v4.5 and enables the derive feature.

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