[Feature, SabreTools] Add better valid checking, add stats to help

SabreTools.Helper/Help/Feature.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 
 using SabreTools.Helper.Data;
 
@@ -358,6 +359,12 @@ namespace SabreTools.Helper.Help
 				valid = false;
 			}
 
+			// If we're not valid at this point, we want to check if this flag is a file or a folder
+			if (!valid)
+			{
+				valid = File.Exists(input) || Directory.Exists(input);
+			}
+
 			return valid;
 		}