Make GetGuidFromString public

Author: neon-nyan

ToastCOM/Extensions.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Hi3Helper.Win32.ToastCOM
+{
+    public static class Extensions
+    {
+        public static Guid GetGuidFromString(string str)
+            => CLSIDGuid.GetGuidFromString(str);
+    }
+}