This should fix most icon scaling issues

Improved the IniReader a bit and replaced some old code.

GreenshotPlugin/Core/Enums/MonitorFrom.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Dapplo and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+using System;
+
+namespace GreenshotPlugin.Core.Enums
+{
+    /// <summary>
+    ///     Flags for the MonitorFromRect / MonitorFromWindow "flags" field
+    ///     see <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd145063(v=vs.85).aspx">MonitorFromRect function</a>
+    ///     or see <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd145064(v=vs.85).aspx">MonitorFromWindow function</a>
+    /// </summary>
+    [Flags]
+    public enum MonitorFrom : uint
+    {
+        /// <summary>
+        ///     Returns a handle to the display monitor that is nearest to the rectangle.
+        /// </summary>
+        DefaultToNearest = 0,
+
+        /// <summary>
+        ///     Returns NULL. (why??)
+        /// </summary>
+        DefaultToNull = 1,
+
+        /// <summary>
+        ///     Returns a handle to the primary display monitor.
+        /// </summary>
+        DefaultToPrimary = 2
+    }
+}