PE: Add ability to fetch exports with GetExports()

Il2CppInspector.Common/FileFormatReaders/Export.cs

@@ -0,0 +1,15 @@
+/*
+    Copyright 2020 Katy Coe - http://www.djkaty.com - https://github.com/djkaty
+
+    All rights reserved.
+*/
+
+namespace Il2CppInspector
+{
+    public class Export
+    {
+        public int Ordinal;
+        public string Name;
+        public ulong VirtualAddress;
+    }
+}