Fix models being backwards

- Regression in ModelUtil#rotateToFace

src/main/java/com/jozufozu/flywheel/core/model/ModelUtil.java

@@ -99,7 +99,7 @@ public class ModelUtil {
 			PoseStack stack = new PoseStack();
 			TransformStack.cast(stack)
 					.centre()
-					.rotateToFace(facing)
+					.rotateToFace(facing.getOpposite())
 					.unCentre();
 			return stack;
 		};

src/main/java/com/jozufozu/flywheel/util/transform/MatrixTransformStack.java

@@ -1,6 +1,8 @@
 package com.jozufozu.flywheel.util.transform;
 
 import com.mojang.blaze3d.vertex.PoseStack;
+import com.mojang.math.Matrix3f;
+import com.mojang.math.Matrix4f;
 import com.mojang.math.Quaternion;
 
 public class MatrixTransformStack implements TransformStack {
@@ -64,4 +66,16 @@ public class MatrixTransformStack implements TransformStack {
 		internal.popPose();
 		return this;
 	}
+
+	@Override
+	public TransformStack mulPose(Matrix4f pose) {
+		internal.last().pose().multiply(pose);
+		return this;
+	}
+
+	@Override
+	public TransformStack mulNormal(Matrix3f normal) {
+		internal.last().normal().mul(normal);
+		return this;
+	}
 }

src/main/java/com/jozufozu/flywheel/util/transform/TransformStack.java

@@ -2,7 +2,7 @@ package com.jozufozu.flywheel.util.transform;
 
 import com.mojang.blaze3d.vertex.PoseStack;
 
-public interface TransformStack extends Scale<TransformStack>, Translate<TransformStack>, Rotate<TransformStack>, TStack<TransformStack> {
+public interface TransformStack extends Transform<TransformStack>, TStack<TransformStack> {
 	static TransformStack cast(PoseStack stack) {
 		return (TransformStack) stack;
 	}