Move hardcoded screenshot hotkey into yaml.

OpenRA.Game/Game.cs

@@ -60,6 +60,7 @@ namespace OpenRA
 		public static string EngineVersion { get; private set; }
 
 		static Task discoverNat;
+		static bool takeScreenshot = false;
 
 		public static OrderManager JoinServer(string host, int port, string password, bool recordReplay = true)
 		{
@@ -630,7 +631,10 @@ namespace OpenRA
 				InnerLogicTick(worldRenderer.World.OrderManager);
 		}
 
-		public static bool TakeScreenshot = false;
+		public static void TakeScreenshot()
+		{
+			takeScreenshot = true;
+		}
 
 		static void RenderTick()
 		{
@@ -666,9 +670,9 @@ namespace OpenRA
 				using (new PerfSample("render_flip"))
 					Renderer.EndFrame(new DefaultInputHandler(OrderManager.World));
 
-				if (TakeScreenshot)
+				if (takeScreenshot)
 				{
-					TakeScreenshot = false;
+					takeScreenshot = false;
 					TakeScreenshotInner();
 				}
 			}

OpenRA.Game/Widgets/Widget.cs

@@ -143,12 +143,6 @@ namespace OpenRA.Widgets
 					Root.Visible ^= true;
 					return true;
 				}
-
-				if (hk == Game.Settings.Keys.TakeScreenshotKey)
-				{
-					Game.TakeScreenshot = true;
-					return true;
-				}
 			}
 
 			if (KeyboardFocusWidget != null)