filters

[ghost]

Show more or less detail and omit certain features at different zoom levels. Provide an interface for:

• encoding which features to show/hide for zoom level ranges
• map view and filter edit view side by side or in tabs. click on a feature to show its string type along with buttons to hide/show
• button to toggle showing hidden items with lower opacity while editing
• import and export filters as json
• save, list, and select filters to/from browser storage

Showing/hiding should work with similar syntax as georender-style2png style json.
When you click a feature, it should ask if you want to hide the particular feature "amenity.cafe" or the whole category "amenity.*"