fix: ignore wiki links inside inline code spans

[zacharywomack8-source]

Fixes #269

\[[\\ and \]]\\ inside inline code spans are falsely reported as unresolved references. The wiki-link regex matches them as a single reference spanning two separate inline code spans, and the existing filter only dropped references fully contained in one code block.

This changes the reference filter to drop any reference that overlaps a code block (fenced or inline) when
eferences_in_codeblocks\ is disabled, via a new \Rangeable::overlaps\ helper.

Verified:

• \cargo build\ clean
• \cargo test: 79 passed, 0 failed
• \cargo fmt --check\ clean
• new regression tests: \wiki_links_in_inline_code_are_not_references, \wiki_links_outside_code_are_still_references\

/claim #269
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