Make DebugLogger usable by not stripping Debug.WriteLine

Fixes #46, #58
Closes #123

src/Splat/DebugLogger.cs

@@ -0,0 +1,20 @@
+// Taken from https://github.com/aspnet/Logging/blob/dev/src/Microsoft.Extensions.Logging.Debug
+
+// We need to define the DEBUG symbol because we want the logger
+// to work even when this package is compiled on release. Otherwise,
+// the call to Debug.WriteLine will not be in the release binary
+#define DEBUG
+
+namespace Splat
+{
+    public class DebugLogger : ILogger
+    {
+        public void Write(string message, LogLevel logLevel)
+        {
+            if ((int)logLevel < (int)Level) return;
+            System.Diagnostics.Debug.WriteLine(message);
+        }
+
+        public LogLevel Level { get; set; }
+    }
+}

src/Splat/Logging.cs

@@ -4,7 +4,6 @@
 using System.Globalization;
 using System.Text;
 using System.Threading;
-using System.Diagnostics;
 using System.Diagnostics.Contracts;
 
 namespace Splat
@@ -159,18 +158,6 @@ public class NullLogger : ILogger
         public LogLevel Level { get; set; }
     }
 
-    public class DebugLogger : ILogger
-    {
-        public void Write(string message, LogLevel logLevel)
-        {
-            if ((int)logLevel < (int)Level) return;
-            Debug.WriteLine(message);
-        }
-
-        public LogLevel Level { get; set; }
-    }
-
-
     /*    
      * LogHost / Logging Mixin
      */