Add RomCenter INI deserialization test, fix issues

SabreTools.Models/RomCenter/MetadataFile.cs

@@ -0,0 +1,24 @@
+namespace SabreTools.Models.RomCenter
+{
+    public class MetadataFile
+    {
+        /// <remarks>[credits]</remarks>
+        public Credits? Credits { get; set; }
+
+        /// <remarks>[dat]</remarks>
+        public Dat? Dat { get; set; }
+
+        /// <remarks>[emulator]</remarks>
+        public Emulator? Emulator { get; set; }
+
+        /// <remarks>[games]</remarks>
+        public Games? Games { get; set; }
+
+        #region DO NOT USE IN PRODUCTION
+
+        /// <remarks>Should be empty</remarks>
+        public string[]? ADDITIONAL_ELEMENTS { get; set; }
+
+        #endregion
+    }
+}