- Modified DNAClassAttribute to also support usage on structs

- Added auto generation of DNAClass attributes on file generation
- Regenerated all files

BlendFile/DNA/GreasePencilOnionSkinningSettings.cs

@@ -13,6 +13,7 @@ using System;
 namespace BlendFile.DNA {
     using BlendFile;
     
+    [DNAClassAttribute(320, "GreasePencilOnionSkinningSettings")]
     public struct GreasePencilOnionSkinningSettings {
         [DNAFieldAttribute(0, "float", "opacity", 4)]
         public float opacity;