Introduce base class for OpenMSX

SabreTools.Models/OpenMSX/SCCPlusCart.cs

@@ -1,30 +1,7 @@
-using System.Xml;
 using System.Xml.Serialization;
 
 namespace SabreTools.Models.OpenMSX
 {
     [XmlRoot("sccpluscart")]
-    public class SCCPlusCart
-    {
-        [XmlElement("boot")]
-        public string? Boot { get; set; }
-
-        [XmlElement("hash")]
-        public string? Hash { get; set; }
-
-        [XmlElement("remark")]
-        public string? Remark { get; set; }
-
-        #region DO NOT USE IN PRODUCTION
-
-        /// <remarks>Should be empty</remarks>
-        [XmlAnyAttribute]
-        public XmlAttribute[]? ADDITIONAL_ATTRIBUTES { get; set; }
-
-        /// <remarks>Should be empty</remarks>
-        [XmlAnyElement]
-        public object[]? ADDITIONAL_ELEMENTS { get; set; }
-
-        #endregion
-    }
+    public class SCCPlusCart : RomBase { }
 }