Split Notes, Lines and Voices into separate files/classes

VocaluxeLib/Songs/CSungLine.cs

@@ -0,0 +1,18 @@
+using System.Linq;
+
+namespace VocaluxeLib.Songs
+{
+    public class CSungLine : CLineBase<CSungNote>
+    {
+        // for drawing perfect line effect
+        public bool PerfectLine { get; set; }
+
+        public bool IsPerfect(CSongLine compareLine)
+        {
+            PerfectLine = _Notes.Count > 0;
+            PerfectLine &= _Notes.Count == compareLine.NoteCount;
+            PerfectLine &= _Notes.All(note => note.Perfect);
+            return PerfectLine;
+        }
+    }
+}