Improve Rhapsode's build with newer tools, fix crashes in history infrastructure.

Various (attempted) crash fixes.

Integrate Shared MIME Info implementation to better label rel=alternate links

Fix markers misserialization.

Ensure marker counters are incremented.

Propagate local attrs through to output.

Read <progress> as a percentage, that's more international.

eSpeak can trivially localize this to it's various locales.

Implement new -rhaps-marker property for controlling user interaction.

Extensively refactor to use the CSS engine's counters implementation.