Remove LayoutKind.Sequential

This may be replaced in the future when byte-serialzable types are more well-defined

PortableExecutable/MenuHeader.cs

@@ -1,13 +1,10 @@
-using System.Runtime.InteropServices;
-
-namespace SabreTools.Models.PortableExecutable
+namespace SabreTools.Models.PortableExecutable
 {
     /// <summary>
     /// Contains version information for the menu resource. The structure definition provided
     /// here is for explanation only; it is not present in any standard header file.
     /// </summary>
     /// <see href="https://learn.microsoft.com/en-us/windows/win32/menurc/menuheader"/>
-    [StructLayout(LayoutKind.Sequential)]
     public sealed class MenuHeader
     {
         /// <summary>