IMediaLibrary: Don't clutter IMediaLibrary with non sensical interfaces requirements

include/IMediaLibrary.h

@@ -29,7 +29,7 @@ class IParserCb
         virtual void onFileDone( FilePtr file ) = 0;
 };
 
-class IMediaLibrary : public IDiscovererCb
+class IMediaLibrary
 {
     public:
         virtual ~IMediaLibrary() {}

src/MediaLibrary.h

@@ -8,7 +8,7 @@ class Parser;
 #include "IMediaLibrary.h"
 #include "IDiscoverer.h"
 
-class MediaLibrary : public IMediaLibrary
+class MediaLibrary : public IMediaLibrary, public IDiscovererCb
 {
     public:
         MediaLibrary();