Changed WindowsAccentMode (int32) Theme setting to ThemeBlurEnabled (boolean):

- Exposed a new function "SetBlurForWindow" in WindowIntelopHelper that handles the blur.
- Deleted Accent and Test themes
- Changed SimpleBlur and Base themes according to changes

Wox.Core/UserSettings/UserSettingStorage.cs

@@ -56,7 +56,7 @@ namespace Wox.Core.UserSettings
         public string ResultItemFontStretch { get; set; }
 
         [JsonProperty]
-        public int ThemeAccentMode { get; set; }
+        public bool ThemeBlurEnabled { get; set; }
 
         [JsonProperty]
         public double WindowLeft { get; set; }