Changes to camera extrinsic calibration to improve accuracy

Adds Outlier Rejection

Do proper rotation (Quaternion) averaging

When camera sees two targets at once, store that, and store
a single observation to match with other cameras.  This leads
to a lot more good connections

Removed dead code, and refactored a couple pieces, e.g., writing extrinsic file

Also refactored some of the utilities to use quaternion averaging from utils,
and move other utility functions to vision_utils_lib

Change-Id: I918ce9c937d80717daa6659abbb139006506d4cc
Signed-off-by: Jim Ostrowski <yimmy13@gmail.com>
diff --git a/y2023/vision/calibrate_multi_cameras.cc b/y2023/vision/calibrate_multi_cameras.cc
index 8032c764..5c29797 100644
--- a/y2023/vision/calibrate_multi_cameras.cc
+++ b/y2023/vision/calibrate_multi_cameras.cc
@@ -13,6 +13,7 @@
 #include "frc971/vision/charuco_lib.h"
 #include "frc971/vision/extrinsics_calibration.h"
 #include "frc971/vision/target_mapper.h"
+#include "frc971/vision/vision_util_lib.h"
 #include "frc971/vision/visualize_robot.h"
 // clang-format off
 // OpenCV eigen files must be included after Eigen includes
@@ -362,7 +363,7 @@
     }
 
     const TargetMapper::TargetPose target_pose =
-        PoseUtils::TargetPoseFromFbs(*target_pose_fbs);
+        TargetMapper::TargetPoseFromFbs(*target_pose_fbs);
 
     target_poses.emplace_back(target_pose);