Use out var syntax

OpenRA.Game/Widgets/ChromeMetrics.cs

@@ -35,8 +35,7 @@ namespace OpenRA.Widgets
 
 		public static bool TryGet<T>(string key, out T result)
 		{
-			string s;
-			if (!data.TryGetValue(key, out s))
+			if (!data.TryGetValue(key, out var s))
 			{
 				result = default(T);
 				return false;

OpenRA.Game/Widgets/WidgetLoader.cs

@@ -37,8 +37,7 @@ namespace OpenRA
 
 		public Widget LoadWidget(WidgetArgs args, Widget parent, string w)
 		{
-			MiniYamlNode ret;
-			if (!widgets.TryGetValue(w, out ret))
+			if (!widgets.TryGetValue(w, out var ret))
 				throw new InvalidDataException("Cannot find widget with Id `{0}`".F(w));
 
 			return LoadWidget(args, parent, ret);