[CSSProcessor] Replace utf8_codepoint_at with utf8_ord#202
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Adds support for rewriting URLs inside CSS syntax, e.g. here: ```html <div style="background-image:url(/wp-content/uploads/2025/09/image-2-766x1024.jpeg)"> ``` Before this PR, the `style` attributes in, e.g., the cover block were skipped by the URL rewriter and continued pointing to the old site. Fixes #223 ## Implementation details This PR backports `CSSProcessor`, `CSSURLProcessor`, and a few related PRs around Unicode handling from the WordPress/php-toolkit repo: * WordPress/php-toolkit#197 * WordPress/php-toolkit#195 * WordPress/php-toolkit#199 * WordPress/php-toolkit#200 * WordPress/php-toolkit#201 * WordPress/php-toolkit#202 Note the CSSProcessor and CSSURLProcessor are tested against 300 test cases containing various tricky inputs, quoted and unquoted URLs, strings, comments, unicode escape sequences, and more. ## Testing instructions This PR comes with a new test case specifically for various tricky CSS inputs. You're also welcome to try and import a WXR file that contains an inline background-image reference and confirm the URL is correctly rewritten.
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Replaces the
utf8_codepoint_at()call inCSSProcessorwithutf8_ord(). This removes the last reference toutf8_codepoint_at()from the codebase so the next PR will remove that function, see #200 for prior context.cc @dmsnell