Added interop support to click through windows.

osrs-toolbox/APIs/WindowsServices.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace osrs_toolbox
+{
+    public static class WindowsServices
+    {
+        const int WS_EX_TRANSPARENT = 0x00000020;
+        const int GWL_EXSTYLE = (-20);
+
+        [DllImport("user32.dll")]
+        static extern int GetWindowLong(IntPtr hwnd, int index);
+
+        [DllImport("user32.dll")]
+        static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);
+
+        public static void SetWindowExTransparent(IntPtr hwnd)
+        {
+            var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
+            SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT);
+        }
+    }
+}