Move hardcoded screenshot hotkey into yaml.

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -822,6 +822,7 @@
     <Compile Include="Lint\CheckChromeHotkeys.cs" />
     <Compile Include="UtilityCommands\LintInterfaces.cs" />
     <Compile Include="Widgets\Logic\SingleHotkeyBaseLogic.cs" />
+    <Compile Include="Widgets\Logic\ScreenshotHotkeyLogic.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">

OpenRA.Mods.Common/Widgets/Logic/ScreenshotHotkeyLogic.cs

@@ -0,0 +1,31 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2017 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Mods.Common.Lint;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	[ChromeLogicArgsHotkeys("TakeScreenshotKey")]
+	public class ScreenshotHotkeyLogic : SingleHotkeyBaseLogic
+	{
+		[ObjectCreator.UseCtor]
+		public ScreenshotHotkeyLogic(Widget widget, Dictionary<string, MiniYaml> logicArgs)
+			: base(widget, "TakeScreenshotKey", "GLOBAL_KEYHANDLER", logicArgs) { }
+
+		protected override bool OnHotkeyActivated(KeyInput e)
+		{
+			Game.TakeScreenshot();
+			return true;
+		}
+	}
+}