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/Data/Globals.cs

@@ -1,15 +1,10 @@
 using System;
+using System.IO;
 using System.Reflection;
 using System.Threading.Tasks;
 
 using SabreTools.Library.Tools;
 
-#if MONO
-using System.IO;
-#else
-using Alphaleonis.Win32.Filesystem;
-#endif
-
 namespace SabreTools.Library.Data
 {
     /// <summary>
@@ -31,9 +26,8 @@ namespace SabreTools.Library.Data
             get
             {
                 if (_logger == null)
-                {
                     _logger = new Logger();
-                }
+
                 return _logger;
             }
             set { _logger = value; }