Fixes as reported by @ccd0.
Rewrite the Filter.
Add per-filter anonymizing.
Close #854.
Recursive setting for filters.
Close #623.
Close #779.
Fix importing and conversion of old filters.
Re-arrange filter items to save some space.
Add importing/exporting of filters.
Close #942.
Focus the filter input when creating new filters.
Fix conversion of highlight class and pinning.
Move filter buttons at the top.
Create new filters at the top of the list.
Enable the save button immediately on text input.
Save the filter when pressing enter.
Filter exceptions. Close #792.
Filter notifications.