Smoothed download bar, fixed many warnings

LightlessSync/Utils/SeStringUtils.cs

@@ -57,10 +57,9 @@ public static class SeStringUtils
                 continue;
 
             var hasColor = fragment.Color.HasValue;
-            Vector4 color = default;
             if (hasColor)
             {
-                color = fragment.Color!.Value;
+                Vector4 color = fragment.Color!.Value;
                 builder.PushColorRgba(color);
             }
 
@@ -233,7 +232,7 @@ public static class SeStringUtils
         protected abstract byte ChunkType { get; }
     }
 
-    private class ColorPayload : AbstractColorPayload
+    private sealed class ColorPayload : AbstractColorPayload
     {
         protected override byte ChunkType => 0x13;
 
@@ -247,12 +246,12 @@ public static class SeStringUtils
         public ColorPayload(Vector4 color) : this(new Vector3(color.X, color.Y, color.Z)) { }
     }
 
-    private class ColorEndPayload : AbstractColorEndPayload
+    private sealed class ColorEndPayload : AbstractColorEndPayload
     {
         protected override byte ChunkType => 0x13;
     }
 
-    private class GlowPayload : AbstractColorPayload
+    private sealed class GlowPayload : AbstractColorPayload
     {
         protected override byte ChunkType => 0x14;
 
@@ -266,7 +265,7 @@ public static class SeStringUtils
         public GlowPayload(Vector4 color) : this(new Vector3(color.X, color.Y, color.Z)) { }
     }
 
-    private class GlowEndPayload : AbstractColorEndPayload
+    private sealed class GlowEndPayload : AbstractColorEndPayload
     {
         protected override byte ChunkType => 0x14;
     }