- Modified DNAClassAttribute to also support usage on structs

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

BlendFile/DNA/EnvelopeGpencilModifierData.cs

@@ -13,6 +13,7 @@ using System;
 namespace BlendFile.DNA {
     using BlendFile;
     
+    [DNAClassAttribute(306, "EnvelopeGpencilModifierData")]
     public class EnvelopeGpencilModifierData {
         [DNAFieldAttribute(0, "GpencilModifierData", "modifier", 104)]
         public GpencilModifierData modifier;