Perform some TODO cleanup

SabreTools.Filtering/Cleaner.cs

@@ -337,7 +337,6 @@ namespace SabreTools.Filtering
         /// <param name="datItem">DatItem to check</param>
         /// <param name="sub">True if this is a subitem, false otherwise</param>
         /// <returns>True if the item passed the filter, false otherwise</returns>
-        /// TODO: Split this somehow
         /// TODO: Name can be made into a common one if name exists
         public bool PassesFilters(DatItem datItem, bool sub = false)
         {

SabreTools.Filtering/DatHeaderFilter.cs

@@ -9,8 +9,6 @@ namespace SabreTools.Filtering
     /// <summary>
     /// Represents the filtering operations that need to be performed on a DatHeader
     /// </summary>
-    /// TODO: Investigate how to reduce the amount of hardcoded filter statements
-    /// TODO: Add DatHeader filters
     public class DatHeaderFilter : Filter
     {
         #region Constructors

SabreTools.Filtering/DatItemFilter.cs

@@ -9,8 +9,6 @@ namespace SabreTools.Filtering
     /// <summary>
     /// Represents the filtering operations that need to be performed on a set of items, usually a DAT
     /// </summary>
-    /// TODO: Can clever use of Filtering allow for easier external splitting methods?
-    /// TODO: Investigate how to reduce the amount of hardcoded filter statements
     public class DatItemFilter : Filter
     {
         #region Fields

SabreTools.Filtering/MachineFilter.cs

@@ -9,8 +9,6 @@ namespace SabreTools.Filtering
     /// <summary>
     /// Represents the filtering operations that need to be performed on a set of items, usually a DAT
     /// </summary>
-    /// TODO: Can clever use of Filtering allow for easier external splitting methods?
-    /// TODO: Investigate how to reduce the amount of hardcoded filter statements
     public class MachineFilter : Filter
     {
         #region Fields