Move the AssetBrowserFileEndingsFilter to IGlobalModData

to avoid mods having to duplicate the whole chrome layout.

OpenRA.Mods.Common/AssetBrowser.cs

@@ -0,0 +1,19 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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
+
+namespace OpenRA
+{
+	public class AssetBrowser : IGlobalModData
+	{
+		[FieldLoader.Require]
+		public readonly string[] SupportedExtensions = new string[0];
+	}
+}