[Database] restored id on Artist, Genre and Release tables. Added basic MusicBrainz ID support. Improved search filters a bit

src/database/Types.hpp

@@ -19,8 +19,10 @@
 
 // header file aimed to ease database class declarations
 
+#include "Artist.hpp"
 #include "Track.hpp"
 #include "Playlist.hpp"
+#include "Release.hpp"
 #include "Video.hpp"
 #include "MediaDirectory.hpp"
 #include "User.hpp"