Add ExternalHelpers project and move all externally acquired dependencies there

ExternalHelpers/WindowsSettingsBrightnessController.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Management;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PowerControl.Helpers
+{
+    /// <summary>
+    /// Taken from: https://gist.github.com/maxkoshevoi/b8a1ad91f4d2a9fd3931168c14080694
+    /// </summary>
+    public static class WindowsSettingsBrightnessController
+    {
+        public static int Get(double roundValue = 10.0)
+        {
+            return (int)(Math.Round(Get() / roundValue) * roundValue);
+        }
+
+        public static int Get()
+        {
+            try
+            {
+                using var mclass = new ManagementClass("WmiMonitorBrightness")
+                {
+                    Scope = new ManagementScope(@"\\.\root\wmi")
+                };
+                using var instances = mclass.GetInstances();
+                foreach (ManagementObject instance in instances)
+                {
+                    return (byte)instance.GetPropertyValue("CurrentBrightness");
+                }
+                return -1;
+            }
+            catch
+            {
+                return -1;
+            }
+        }
+
+        public static void Set(int brightness)
+        {
+            using var mclass = new ManagementClass("WmiMonitorBrightnessMethods")
+            {
+                Scope = new ManagementScope(@"\\.\root\wmi")
+            };
+            using var instances = mclass.GetInstances();
+            var args = new object[] { 1, brightness };
+            foreach (ManagementObject instance in instances)
+            {
+                instance.InvokeMethod("WmiSetBrightness", args);
+            }
+        }
+    }
+}