Better logger

1. Throw exception for fatal/error log when debugging
2. Write to debug output for warn/debug/info log when debugging
3. part of #355

Wox.Infrastructure/Exception/WoxFatalException.cs

@@ -0,0 +1,12 @@
+namespace Wox.Core.Exception
+{
+    /// <summary>
+    /// Represent exceptions that wox can't handle and MUST close running Wox.
+    /// </summary>
+    public class WoxFatalException : WoxException
+    {
+        public WoxFatalException(string msg) : base(msg)
+        {
+        }
+    }
+}