Statistics Collection / Writing Overhaul (#35)

* Add DatStatistics class

* Add isDirectory setting

* Add CalculateStatistics method (nw)

* Add separate stats writing

* Use new methods

* Rename Write -> WriteIndividual

* Naive implementation of new writing (nw)

* Remove unncessary calls

* Make writing more DatFile-like

* Add console flag to constructor

* Remove unused stream constructors

* Move to local writers

* Remove inherent filename

* Fix invocation

* Use SeparatedValueWriter

* Fix final directory stats output

* Use XmlTextWriter for HTML

* Don't output separator on last stat output

* Remove now-completed TODOs

* Remove unused using

SabreTools.Reports/DatStatistics.cs

@@ -0,0 +1,30 @@
+using SabreTools.DatFiles;
+
+namespace SabreTools.Reports
+{
+    /// <summary>
+    /// Statistics wrapper for outputting
+    /// </summary>
+    public class DatStatistics
+    {
+        /// <summary>
+        /// ItemDictionary representing the statistics
+        /// </summary>
+        public ItemDictionary Statistics { get; set; }
+        
+        /// <summary>
+        /// Name to display on output
+        /// </summary>
+        public string DisplayName { get; set; }
+
+        /// <summary>
+        /// Total machine count to use on output
+        /// </summary>
+        public long MachineCount { get; set; }
+
+        /// <summary>
+        /// Determines if statistics are for a directory or not
+        /// </summary>
+        public bool IsDirectory { get; set; } = false;
+    }
+}