Engines
- CACHE_TIMEOUT : rss.cpp
- FAVICONINTERFACE : rss.cpp
- forMatchingSources : filebrowserengine.cpp
- InvalidIfEmpty : filebrowserengine.cpp
- ION_EXPORT : ion_export.h
- ION_EXPORT_DEPRECATED : ion_export.h
- MINIMUM_INTERVAL : rss.cpp
- TIMEOUT : rss.cpp