Improve NoScript and Browser integration
- [x] Extract Security Level backend functionality from torbutton and make into separate firefox patch
- [x] Move Security Level UI Patch before the tor-browser split in firefox
- [x] Ensure only depends on strings in the new localization project (see https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/40924 )
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- [ ] Update browser threat-model doc
- [ ] Determine *what* functionality we want to expose to the user
- [ ] Integrate NoScript as a system extension
- [ ] Build some system for NoSript to trigger 'native' browser UI (modals, etc)
- [ ] Implement w/e ~"UX Team" comes up with
- [ ] Allow about:addons intalled NoScript to override system-extension NoScript and disable w/e custom security features we have
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