move Tooltip into it's own CS file

OpenRA.Mods.RA/Tooltip.cs

@@ -0,0 +1,41 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using OpenRA.FileFormats;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	[Desc("Shown in the build palette widget.")]
+	public class TooltipInfo : ITraitInfo
+	{
+		public readonly string Description = "";
+		public readonly string Name = "";
+		[Desc("Defaults to actor name + icon suffix.")]
+		public readonly string Icon = null;
+
+		public virtual object Create(ActorInitializer init) { return new Tooltip(init.self, this); }
+	}
+
+	public class Tooltip : IToolTip
+	{
+		Actor self;
+		TooltipInfo Info;
+
+		public string Name() { return Info.Name; }
+		public Player Owner() { return self.Owner; }
+
+		public Tooltip(Actor self, TooltipInfo info)
+		{
+			this.self = self;
+			Info = info;
+		}
+	}
+}