Add favorites, cached built-in playlists (#11)

app/src/main/kotlin/it/vfsfitvnm/vimusic/Database.kt

@@ -52,10 +52,6 @@ interface Database {
         }
     }
 
-    @Transaction
-    @Query("SELECT * FROM Song WHERE totalPlayTimeMs > 0 ORDER BY ROWID DESC")
-    fun history(): Flow<List<DetailedSong>>
-
     @Transaction
     @Query("SELECT * FROM Song WHERE likedAt IS NOT NULL ORDER BY likedAt DESC")
     fun favorites(): Flow<List<DetailedSong>>