Add per-machine filtering to Batch

SabreTools.Library/DatItems/Machine.cs

@@ -513,14 +513,6 @@ namespace SabreTools.Library.DatItems
 
         #endregion
 
-        // TODO: Can there be a special filter for machine that says if one item in a machine
-        // explicitly passes then the machine is included? This will be difficult to attempt to
-        // implement because technically, you'd want to keep games that don't match a negative
-        // instead of the inverse. Possible way of doing it would be: filter on machine-level
-        // things first, then see if any items inside explicitly fail. If ANY fail inside, filter
-        // out the machine. This would likely have to be an entirely separate flag. A proof
-        // of concept implementation would be best first, likely living under Filtering of
-        // the DatFile class.
         #region Filtering
 
         /// <summary>