v2.0.0 - PHP 8.5, WhatWG URLs, and better CLI output

[spaze]

New major release, with many BC breaks.

PHP 8.5

• PHP 8.5 is now required (Use the Uri\WhatWg\Url class instead of parse_url() #81)

WhatWG URLs

• Use Uri\WhatWg\Url instead of parse_url() everywhere (Use the Uri\WhatWg\Url class instead of parse_url() #81)
• Support ports in URLs (Support ports in URL to check #82)

CLI

• Add --verbose flag - without it, only the essential output is shown (selected URL, warnings, errors, and the final verdict) (Add --verbose to checksecuritytxt.php #95)
• Add [OK] output level (Simplify the console color output #94)
• Final verdict line is now fully colored (Simplify the console color output #94)
• Callbacks are now registered once - calling check() multiple times no longer accumulates handlers

Other changes

• Add UTF-8 body content validation (Add UTF-8 body content validation #89)
• Make the max fetch length configurable (Max length configurable and docs update #85)

Internal changes

• Use exit(...) as a first-class callable (Use exit(...) as a function #93)
• Switch to httpbin.org for configurable-length downloads in tests (Switch to httpbin.org for downloads, can download arbitrary-length files #86)
• Correct cURL client name (Correct name for the cURL client after we've switched to it #84)
• Simplify env vars in tests (Simplify env vars in tests #90)
• Add shipmonk/dead-code-detector to PHPStan config (Add shipmonk/dead-code-detector to PHPStan config #91)
• Improve README (Improve README and get ready for 2.0 release #83)

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