[wpilibc] Transition C++ classes to units::second_t (#3396)

A lot of these are breaking changes. frc::Timer was replaced with the
contents of frc2::Timer. The others were in-place argument changes or
removing deprecated non-unit overloads.

wpilibNewCommands/src/main/native/include/frc2/command/MecanumControllerCommand.h

@@ -7,6 +7,7 @@
 #include <initializer_list>
 #include <memory>
 
+#include <frc/Timer.h>
 #include <frc/controller/HolonomicDriveController.h>
 #include <frc/controller/PIDController.h>
 #include <frc/controller/ProfiledPIDController.h>
@@ -24,7 +25,6 @@
 
 #include "CommandBase.h"
 #include "CommandHelper.h"
-#include "frc2/Timer.h"
 
 #pragma once
 
@@ -444,7 +444,7 @@ class MecanumControllerCommand
       m_outputVolts;
 
   bool m_usePID;
-  frc2::Timer m_timer;
+  frc::Timer m_timer;
   frc::MecanumDriveWheelSpeeds m_prevSpeeds;
   units::second_t m_prevTime;
 };