More async init, add proper NLog target for WPF and free console in UI mode

Torch.Server/FlowDocumentTarget.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Documents;
+using System.Windows.Media;
+using NLog;
+using NLog.Targets;
+
+namespace Torch.Server
+{
+    [Target("flowDocument")]
+    public sealed class FlowDocumentTarget : TargetWithLayout
+    {
+        private FlowDocument _document = new FlowDocument { Background = new SolidColorBrush(Colors.Black) };
+        private readonly Paragraph _paragraph = new Paragraph();
+
+        public FlowDocument Document => _document;
+
+        public FlowDocumentTarget()
+        {
+            _document.Blocks.Add(_paragraph);
+        }
+
+        /// <inheritdoc />
+        protected override void Write(LogEventInfo logEvent)
+        {
+            _document.Dispatcher.BeginInvoke(() =>
+            {
+                var message = $"{Layout.Render(logEvent)}\n";
+                _paragraph.Inlines.Add(new Run(message) {Foreground = LogLevelColors[logEvent.Level]});
+            });
+        }
+
+        private static readonly Dictionary<LogLevel, SolidColorBrush> LogLevelColors = new Dictionary<LogLevel, SolidColorBrush>
+        {
+            [LogLevel.Trace] = new SolidColorBrush(Colors.DimGray),
+            [LogLevel.Debug] = new SolidColorBrush(Colors.DarkGray),
+            [LogLevel.Info] = new SolidColorBrush(Colors.White),
+            [LogLevel.Warn] = new SolidColorBrush(Colors.Magenta),
+            [LogLevel.Error] = new SolidColorBrush(Colors.Yellow),
+            [LogLevel.Fatal] = new SolidColorBrush(Colors.Red),
+        };
+    }
+}