added protocol versioning. AssignPlayer order is dead.

OpenRa.FileFormats/OpenRa.FileFormats.csproj

@@ -72,6 +72,7 @@
     <Compile Include="Palette.cs" />
     <Compile Include="PlayerColorRemap.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ProtocolVersion.cs" />
     <Compile Include="Session.cs" />
     <Compile Include="ShpReader.cs" />
     <Compile Include="ShroudPaletteRemap.cs" />

OpenRa.FileFormats/ProtocolVersion.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.FileFormats
+{
+	public static class ProtocolVersion
+	{
+		// you *must* increment this whenever you make an incompatible protocol change
+		public static readonly int Version = 1;
+	}
+}