Cannot simulate non-field tag layouts for multitag estimation

[amquake]

photonvision/photon-lib/src/main/java/org/photonvision/simulation/PhotonCameraSim.java

Lines 84 to 85 in 782929b

	private final AprilTagFieldLayout tagLayout =
	AprilTagFieldLayout.loadField(AprilTagFields.kDefaultField);

photonvision/photon-lib/src/main/java/org/photonvision/simulation/PhotonCameraSim.java

Lines 525 to 527 in 782929b

	// TODO: Implement ATFL subscribing in backend
	// var tagLayout = cam.getAprilTagFieldLayout();
	var visibleLayoutTags = VisionEstimation.getVisibleLayoutTags(detectableTgts, tagLayout);

As ATFLs are currently handled through the UI, there is no way to specify custom layouts in simulation with the existing API. See #1629.

An alternative to implementing ATFL subscribing would be to overwrite a PhotonCameraSim's stored ATFL that it uses for simulating multitag estimation manually or with an ATFL created from a VisionSystemSim's apriltag targets, but this seems a bit messy.