Various (attempted) crash fixes.
Remove global variable, move to Page field.
Log browser history in memory
Add 'pseudolinks' for tab history, apps, & bookmarks.
Extract data for 'pseudolinks', exposing more features.
Extensively refactor to use the CSS engine's counters implementation.
Upload Types modules, & useragent stylesheet with audio cues. Prevent websites (and userstyles) from overriding the link audio cue.