Nest all namespaces

The compiler supports this now.  We can type less going forward.
No functional changes.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I29d6fa4f9aacc0e381f1a7637294db0392466995
diff --git a/y2022_bot3/control_loops/superstructure/superstructure.cc b/y2022_bot3/control_loops/superstructure/superstructure.cc
index f701907..3dfa74c 100644
--- a/y2022_bot3/control_loops/superstructure/superstructure.cc
+++ b/y2022_bot3/control_loops/superstructure/superstructure.cc
@@ -4,9 +4,7 @@
 #include "aos/flatbuffer_merge.h"
 #include "frc971/zeroing/wrap.h"
 
-namespace y2022_bot3 {
-namespace control_loops {
-namespace superstructure {
+namespace y2022_bot3::control_loops::superstructure {
 
 using frc971::control_loops::AbsoluteEncoderProfiledJointStatus;
 using frc971::control_loops::PotAndAbsoluteEncoderProfiledJointStatus;
@@ -89,6 +87,4 @@
   (void)status->Send(status_builder.Finish());
 }
 
-}  // namespace superstructure
-}  // namespace control_loops
-}  // namespace y2022_bot3
+}  // namespace y2022_bot3::control_loops::superstructure