Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/y2022/vision/ball_color.h b/y2022/vision/ball_color.h
index 695d2e3..824cf30 100644
--- a/y2022/vision/ball_color.h
+++ b/y2022/vision/ball_color.h
@@ -9,8 +9,7 @@
 #include "y2022/constants.h"
 #include "y2022/vision/ball_color_generated.h"
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 using namespace frc971::vision;
 
@@ -62,6 +61,5 @@
   const cv::Rect reference_blue_;
   const cv::Rect ball_location_;
 };
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 #endif
diff --git a/y2022/vision/blob_detector.h b/y2022/vision/blob_detector.h
index a60316a..93bba09 100644
--- a/y2022/vision/blob_detector.h
+++ b/y2022/vision/blob_detector.h
@@ -4,8 +4,7 @@
 #include <opencv2/features2d.hpp>
 #include <opencv2/imgproc.hpp>
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 class BlobDetector {
  public:
@@ -52,7 +51,6 @@
 
   static void ExtractBlobs(cv::Mat bgr_image, BlobResult *blob_result);
 };
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 
 #endif  // Y2022_BLOB_DETECTOR_H_
diff --git a/y2022/vision/camera_reader.h b/y2022/vision/camera_reader.h
index 8782886..54fcb30 100644
--- a/y2022/vision/camera_reader.h
+++ b/y2022/vision/camera_reader.h
@@ -20,8 +20,7 @@
 #include "y2022/vision/target_estimate_generated.h"
 #include "y2022/vision/target_estimator.h"
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 using namespace frc971::vision;
 using frc971::controls::LedOutput;
@@ -163,6 +162,5 @@
   GPIOControl gpio_disable_control_;
 };
 
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 #endif  // Y2022_VISION_CAMERA_READER_H_
diff --git a/y2022/vision/gpio.h b/y2022/vision/gpio.h
index 6ed7328..d7b44d4 100644
--- a/y2022/vision/gpio.h
+++ b/y2022/vision/gpio.h
@@ -14,8 +14,7 @@
 
 #include "aos/init.h"
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 using namespace frc971::vision;
 
@@ -353,6 +352,5 @@
   aos::TimerHandler *const pwm_timer_;
 };
 
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 #endif  // Y2022_VISION_GPIO_H_