Add Fat Mach-O (Universal Binary) support

Fix fieldOffsets bug in some metadata versions
Add support for generic multi-architecture binaries
Add Mach-O section RVA mapping

Il2CppInspector/UBHeaders.cs

@@ -0,0 +1,36 @@
+/*
+    Copyright 2017 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
+
+    All rights reserved.
+*/
+
+using System;
+using NoisyCowStudios.Bin2Object;
+
+namespace Il2CppInspector
+{
+#pragma warning disable CS0649
+    // Structures and enums: https://cocoaintheshell.whine.fr/2009/07/universal-binary-mach-o-format/
+
+    public enum UB : uint
+    {
+        FAT_MAGIC = 0xcafebabe
+    }
+
+    // Big-endian
+    internal class FatHeader
+    {
+        public uint Magic;
+        public uint NumArch;
+    }
+
+    // Big-endian
+    internal class FatArch
+    {
+        public uint CPUType;
+        public uint CPUSubType;
+        public uint Offset;
+        public uint Size;
+        public uint Align;
+    }
+}