new features:
- added auto update for beta versions
- options: made sections collapsible
- clear persistent rng data if a container is deleted
- added tool to clear persistent rng for a specific container
fixes:
- improved protection of (i)frame properties
- document.write and document.writeln protection broke pages
- race condition causes persistent rnd separation between containers to leak
known issues:
- if a data URL is blocked the page action button does not appear