PLAYA-PDF v0.7.0: Vastly improved structure and marked content

PLAYA 0.7.0: 2025-08-04

• Remove long-deprecated functions
• Add and document finalize method on ContentObjects
• Make PageList work more or less like a Sequence
• Support iteration over playa.structure.ContentItem
• Greatly increase test coverage
• Greatly optimize marked content section access
• Add find and find_all methods to page.structure
• Extract CMYK images (except JPEG/JPEG2000) as TIFF

What's Changed

• fix: correct and test rotation behaviour which was very broken by @dhdaines in #167
• fix: use decode_text almost everywhere for utf-16 by @dhdaines in #168
• Improve coverage and fix bugs by @dhdaines in #161
• refactor: image extraction part 2 by @lambdalemon in #163
• feat: extract cmyk images as tiff by @lambdalemon in #170
• Greatly accelerate and improve logical structure tasks by @dhdaines in #165

Full Changelog: v0.6.6...v0.7.0