- Fix Logger dependency issue in 8.4.5+.
- Add videos to the sitemap.xml. (see https://support.google.com/webmasters/answer/80471?hl=en)
- Approved by PRB.
- Cleanup (feedback from PRB).
- Add 'isComplete' method, to make sure the structured data and sitemap only list
videos that have all required attributes.
- Change naming to 'Core Video Player', to avoid confusion.
- Remove unused embed* methods.
- Use on_block_output to add a structured data section.
- Only works with the core 'Video Player' block.