Add a mechanism to add palettes via traits

OpenRa.Game/Traits/PaletteFromFile.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using OpenRa.FileFormats;
+
+namespace OpenRa.Traits
+{
+	class PaletteFromFileInfo : ITraitInfo
+	{
+		public readonly string Name = "Undefined";
+		public readonly string Theatre = "Undefined";
+		public readonly string Filename = "";
+		public readonly string Remap = "";
+		public object Create(Actor self) { return new PaletteFromFile(self, this); }
+	}
+
+	class PaletteFromFile
+	{
+		public PaletteFromFile(Actor self, PaletteFromFileInfo info)
+		{
+			Log.Write("Created palette");
+			if (info.Theatre == "Undefined" || 
+				info.Theatre.ToLowerInvariant() == self.World.Map.Theater.ToLowerInvariant())
+			{
+				self.World.WorldRenderer.AddPalette(info.Name, new Palette(FileSystem.Open("temperat_ra.pal")));
+			}
+		}
+	}
+}