Cleanup and overhaul (#21)

* Syntax cleanup

* More minor cleanup, use Linq

* Fix broken features by using correct values

* Feature flags the same

* Features are modular

* No AlphaFS, more .NET versions

* Fix appveyor

* Put back identifiers, for some reason

* String interpolation, modernization

* Better use of GetField

* XmlTextWriter to remove possible issues

* Fix header for OpenMSX

SabreTools.Library/DatItems/Archive.cs

@@ -14,7 +14,7 @@ namespace SabreTools.Library.DatItems
         /// </summary>
         public Archive()
         {
-            this.Name = "";
+            this.Name = string.Empty;
             this.ItemType = ItemType.Archive;
         }
 
@@ -69,12 +69,10 @@ namespace SabreTools.Library.DatItems
         {
             // If we don't have an archive, return false
             if (this.ItemType != other.ItemType)
-            {
                 return false;
-            }
 
             // Otherwise, treat it as an archive
-            Archive newOther = (Archive)other;
+            Archive newOther = other as Archive;
 
             // If the archive information matches
             return (this.Name == newOther.Name);