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/drivetrain/drivetrain_base.cc b/y2022_bot3/control_loops/drivetrain/drivetrain_base.cc
index a97e0dd..dc89588 100644
--- a/y2022_bot3/control_loops/drivetrain/drivetrain_base.cc
+++ b/y2022_bot3/control_loops/drivetrain/drivetrain_base.cc
@@ -14,9 +14,7 @@
 
 namespace chrono = ::std::chrono;
 
-namespace y2022_bot3 {
-namespace control_loops {
-namespace drivetrain {
+namespace y2022_bot3::control_loops::drivetrain {
 
 using ::frc971::constants::ShifterHallEffect;
 
@@ -66,6 +64,4 @@
   return kDrivetrainConfig;
 };
 
-}  // namespace drivetrain
-}  // namespace control_loops
-}  // namespace y2022_bot3
+}  // namespace y2022_bot3::control_loops::drivetrain
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
diff --git a/y2022_bot3/control_loops/superstructure/superstructure_lib_test.cc b/y2022_bot3/control_loops/superstructure/superstructure_lib_test.cc
index 614bc08..493d2f5 100644
--- a/y2022_bot3/control_loops/superstructure/superstructure_lib_test.cc
+++ b/y2022_bot3/control_loops/superstructure/superstructure_lib_test.cc
@@ -15,10 +15,7 @@
 DEFINE_string(output_folder, "",
               "If set, logs all channels to the provided logfile.");
 
-namespace y2022_bot3 {
-namespace control_loops {
-namespace superstructure {
-namespace testing {
+namespace y2022_bot3::control_loops::superstructure::testing {
 namespace chrono = std::chrono;
 
 using ::aos::monotonic_clock;
@@ -472,7 +469,4 @@
   TestRoller(0.0);
 }
 
-}  // namespace testing
-}  // namespace superstructure
-}  // namespace control_loops
-}  // namespace y2022_bot3
\ No newline at end of file
+}  // namespace y2022_bot3::control_loops::superstructure::testing