Move mod-level ActorInits out of the engine.

OpenRA.Mods.Common/ActorInitializer.cs

@@ -0,0 +1,40 @@
+using System;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common
+{
+	public class FacingInit : IActorInit<int>
+	{
+		[FieldFromYamlKey] readonly int value = 128;
+		public FacingInit() { }
+		public FacingInit(int init) { value = init; }
+		public int Value(World world) { return value; }
+	}
+
+	public class SubCellInit : IActorInit<SubCell>
+	{
+		[FieldFromYamlKey] readonly int value = (int)SubCell.FullCell;
+		public SubCellInit() { }
+		public SubCellInit(int init) { value = init; }
+		public SubCellInit(SubCell init) { value = (int)init; }
+		public SubCell Value(World world) { return (SubCell)value; }
+	}
+
+	public class CenterPositionInit : IActorInit<WPos>
+	{
+		[FieldFromYamlKey] readonly WPos value = WPos.Zero;
+		public CenterPositionInit() { }
+		public CenterPositionInit(WPos init) { value = init; }
+		public WPos Value(World world) { return value; }
+	}
+
+	// Allows maps / transformations to specify the faction variant of an actor.
+	public class FactionInit : IActorInit<string>
+	{
+		[FieldFromYamlKey] public readonly string Faction;
+
+		public FactionInit() { }
+		public FactionInit(string faction) { Faction = faction; }
+		public string Value(World world) { return Faction; }
+	}
+}