- Modified DNAClassAttribute to also support usage on structs

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

BlendFile/DNA/GreasePencilDrawing.cs

@@ -13,6 +13,7 @@ using System;
 namespace BlendFile.DNA {
     using BlendFile;
     
+    [DNAClassAttribute(308, "GreasePencilDrawing")]
     public class GreasePencilDrawing {
         [DNAFieldAttribute(0, "GreasePencilDrawingBase", "base", 8)]
         public GreasePencilDrawingBase @base;