* Update default favicon provider
* Add domain placeholder for favicon providers
* Fix favicon loader to handle streaming response
* Handle different mime types for favicons
* Use 32px size by default
* Update documentation
* Skip mime-type test for now
* Manually configure image/x-icon mime type
The Wayback Machine Save API only allows a limited number of requests within a timespan. This introduces several changes to avoid rate limit errors:
- There will be max. 1 attempt to create a new snapshot
- If a new snapshot could not be created, then attempt to use the latest existing snapshot
- Bulk snapshot updates (bookmark import, load missing snapshots after login) will only attempt to load the latest snapshot instead of creating new ones
