Migrate many models to StructLayout

PortableExecutable/MenuHeader.cs

@@ -1,22 +1,25 @@
-namespace SabreTools.Models.PortableExecutable
+using System.Runtime.InteropServices;
+
+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>
         /// The version number of the menu template. This member must be equal to zero to indicate
         /// that this is an RT_MENU created with a standard menu template.
         /// </summary>
-        public ushort Version { get; set; }
+        public ushort Version;
 
         /// <summary>
         /// The size of the menu template header. This value is zero for menus you create with a
         /// standard menu template.
         /// </summary>
-        public ushort HeaderSize { get; set; }
+        public ushort HeaderSize;
     }
 }