Add a remaining ListXML-specific objects

Also fixes the usage of some other objects, adds proper objects for certain cases, and adds a bunch of TODOs around the new objects. There will be a lot of overhauls needed to properly support things like Devices and Slots

SabreTools.Library/DatItems/Enums.cs

@@ -241,6 +241,18 @@ namespace SabreTools.Library.DatItems
         Mechanical = 1 << 3,
     }
 
+    /// <summary>
+    /// Determine machine runnable status
+    /// </summary>
+    [Flags]
+    public enum Runnable
+    {
+        NULL,
+        No,
+        Partial,
+        Yes,
+    }
+
     /// <summary>
     /// Determine machine support status
     /// </summary>