Extract all converters into separate folder

Wox/Converters/OpacityModeConverter.cs

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+using System;
+using System.Globalization;
+using Wox.Infrastructure.Storage.UserSettings;
+
+namespace Wox.Converters
+{
+    public class OpacityModeConverter : ConvertorBase<OpacityModeConverter>
+    {
+        public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is OpacityMode)) return value.ToString();
+            var mode = (OpacityMode) value;
+            switch (mode)
+            {
+                case OpacityMode.Normal:
+                    return "Normal Window";
+                case OpacityMode.LayeredWindow:
+                {
+                    if (Environment.OSVersion.Version.Major < 5)
+                        return "Layered Window (not supported by your Windows)";
+                    if (Environment.OSVersion.Version.Major == 5)
+                        return "Layered Window (not recommended on your Windows)";
+                    return "Layered Window";
+                }
+                case OpacityMode.DWM:
+                {
+                    if (Environment.OSVersion.Version.Major < 6)
+                        return "DWM-Enabled Window (not supported by your Windows)";
+                    return "DWM-Enabled Window";
+                }
+            }
+            return value.ToString();
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+    }
+}