turtle init stuff

src/kernel/turtle/Turtle.hx

@@ -4,9 +4,16 @@ import kernel.turtle.Types;
 
 using tink.CoreApi;
 
-typedef TurtleSlot = Int;
-
 class Turtle {
+	public static var instance:Turtle;
+
+	@:allow(kernel.Init)
+	private function new() {
+		if (!Turtle.isTurtle()){
+			Log.warn("Tried to initialize Turtle, but it is not available.");
+		}
+	}
+
 	public static function isTurtle():Bool {
 		return true; // TODO: Implement
 	}

src/kernel/turtle/Types.hx

@@ -22,3 +22,5 @@ typedef ItemInspect = {
 	public var damage:Int;
 	public var count:Int;
 }
+
+typedef TurtleSlot = Int;