Migrate many models to StructLayout

PortableExecutable/COFFRelocation.cs

@@ -1,4 +1,6 @@
-namespace SabreTools.Models.PortableExecutable
+using System.Runtime.InteropServices;
+
+namespace SabreTools.Models.PortableExecutable
 {
     /// <summary>
     /// Object files contain COFF relocations, which specify how the section data
@@ -15,6 +17,7 @@
     /// specified in the section header.
     /// </summary>
     /// <see href="https://learn.microsoft.com/en-us/windows/win32/debug/pe-format"/>
+    [StructLayout(LayoutKind.Sequential)]
     public sealed class COFFRelocation
     {
         /// <summary>
@@ -24,7 +27,7 @@
         /// For example, if the first byte of the section has an address of 0x10,
         /// the third byte has an address of 0x12.
         /// </summary>
-        public uint VirtualAddress { get; set; }
+        public uint VirtualAddress;
 
         /// <summary>
         /// A zero-based index into the symbol table. This symbol gives the address
@@ -32,12 +35,13 @@
         /// storage class, then the symbol's address is the address with the first
         /// section of the same name.
         /// </summary>
-        public uint SymbolTableIndex { get; set; }
+        public uint SymbolTableIndex;
 
         /// <summary>
         /// A value that indicates the kind of relocation that should be performed.
         /// Valid relocation types depend on machine type.
         /// </summary>
-        public RelocationType TypeIndicator { get; set; }
+        [MarshalAs(UnmanagedType.U2)]
+        public RelocationType TypeIndicator;
     }
 }