* Implemented BFileInterface class which was nearly empty so far. Added handling of messages passed to BFileInterface class. * Added needed structs and message values to DataExchange. * This is needed to get for instance the reader.media_addon to work. Usually one calls above functions to set a file to be decoded by the node. If the target is a consumer, they are used for setting the target for encoding data. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24671 a95241bf-73f2-0310-859d-f6bbb57e9c96