Mul-ing things over

- Add missing multiply functions to TransformedInstance

common/src/lib/java/dev/engine_room/flywheel/lib/instance/TransformedInstance.java

@@ -41,6 +41,19 @@ public TransformedInstance scale(float x, float y, float z) {
 		return this;
 	}
 
+	public TransformedInstance mul(Matrix4fc other) {
+		pose.mul(other);
+		return this;
+	}
+
+	public TransformedInstance mul(PoseStack.Pose other) {
+		return mul(other.pose());
+	}
+
+	public TransformedInstance mul(PoseStack stack) {
+		return mul(stack.last());
+	}
+
 	public TransformedInstance setTransform(Matrix4fc pose) {
 		this.pose.set(pose);
 		return this;