Use ClrMamePro serializer in current parser

This also starts splitting up the current parser structures to make them a bit more modular.

SabreTools.DatItems/Formats/Chip.cs

@@ -42,7 +42,7 @@ namespace SabreTools.DatItems.Formats
         public long? Clock { get; set; }
 
         [JsonIgnore]
-        public bool ClockTypeSpecified { get { return Clock != null; } }
+        public bool ClockSpecified { get { return Clock != null; } }
 
         #endregion