* Good start
* Impl
* allow responses.add(async { Message::NoOp });
* Fix
* Cache font blob in text node
* Refactor font handling to use Font struct direcly
* Fix fmt
* Embedd Font Resources by default
* Review
* Review
* Cache font info based on ResourceHash
* Use ResourceId for referring to Resources
* Use Doc
* use error for preprocessor ResourceId replacement failure
* Keep hashes in DocumentInfo
* Migrate with less mem copy
* Global ResourceMessage -> ResourceStorageMessage
* Add document ResourceMessage
* Move embedding logic
* Fix
* Cleanup
* Review
* Fix