Pull common extrinsics calibration code out into //frc971/vision

This sets us up to have a generic solver interface, and year specific
data munging.

Change-Id: I5cba597aa263d5061b7c71cd617706460ddb5f93
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2020/vision/calibration.cc b/y2020/vision/calibration.cc
index 0a12d70..1109b58 100644
--- a/y2020/vision/calibration.cc
+++ b/y2020/vision/calibration.cc
@@ -12,7 +12,7 @@
 #include "aos/network/team_number.h"
 #include "aos/time/time.h"
 #include "aos/util/file.h"
-#include "y2020/vision/charuco_lib.h"
+#include "frc971/vision/charuco_lib.h"
 
 DEFINE_string(calibration_folder, ".", "Folder to place calibration files.");
 DEFINE_string(camera_id, "", "Camera ID in format YY-NN-- year and number.");