add ForcedPalette trait (RenderModifier). this can be used for things like c17/mine/trees

OpenRA.Game/OpenRA.Game.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -115,6 +115,7 @@
     <Compile Include="Traits\Attack\AttackOmni.cs" />
     <Compile Include="Traits\Chrome\PowerDownButton.cs" />
     <Compile Include="Traits\CustomSellValue.cs" />
+    <Compile Include="Traits\Modifiers\ForcedPalette.cs" />
     <Compile Include="Traits\Player\SpawnDefaultUnits.cs" />
     <Compile Include="Traits\World\BridgeLoadHook.cs" />
     <Compile Include="Traits\World\ChoosePaletteOnSelect.cs" />
@@ -317,7 +318,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-  <ItemGroup>
-    <Folder Include="Chrome\" />
-  </ItemGroup>
 </Project>

OpenRA.Game/Traits/Modifiers/ForcedPalette.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRA.Traits
+{
+	class ForcedPaletteInfo : ITraitInfo
+	{
+		public readonly string Palette = null;
+		public object Create(Actor self) { return new ForcedPalette(this); }
+	}
+
+	class ForcedPalette : IRenderModifier
+	{
+		string palette;
+
+		public ForcedPalette(ForcedPaletteInfo info) { palette = info.Palette; }
+
+		public IEnumerable<Renderable> ModifyRender(Actor self, IEnumerable<Renderable> r)
+		{
+			return r.Select(rr => rr.WithPalette(palette));
+		}
+	}
+}