[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.

wpilibc/src/main/native/include/frc/Notifier.h

@@ -15,7 +15,6 @@
 
 #include <hal/Types.h>
 #include <units/time.h>
-#include <wpi/deprecated.h>
 #include <wpi/mutex.h>
 
 namespace frc {
@@ -80,19 +79,6 @@ class Notifier {
    */
   void SetHandler(std::function<void()> handler);
 
-  /**
-   * Register for single event notification.
-   *
-   * A timer event is queued for a single event after the specified delay.
-   *
-   * @deprecated Use unit-safe StartSingle(units::second_t delay) method
-   * instead.
-   *
-   * @param delay Seconds to wait before the handler is called.
-   */
-  WPI_DEPRECATED("Use unit-safe StartSingle method instead.")
-  void StartSingle(double delay);
-
   /**
    * Register for single event notification.
    *
@@ -102,22 +88,6 @@ class Notifier {
    */
   void StartSingle(units::second_t delay);
 
-  /**
-   * Register for periodic event notification.
-   *
-   * A timer event is queued for periodic event notification. Each time the
-   * interrupt occurs, the event will be immediately requeued for the same time
-   * interval.
-   *
-   * @deprecated Use unit-safe StartPeriodic(units::second_t period) method
-   * instead
-   *
-   * @param period Period in seconds to call the handler starting one period
-   *               after the call to this method.
-   */
-  WPI_DEPRECATED("Use unit-safe StartPeriodic method instead.")
-  void StartPeriodic(double period);
-
   /**
    * Register for periodic event notification.
    *
@@ -184,10 +154,10 @@ class Notifier {
   std::function<void()> m_handler;
 
   // The absolute expiration time
-  double m_expirationTime = 0;
+  units::second_t m_expirationTime = 0_s;
 
   // The relative time (either periodic or single)
-  double m_period = 0;
+  units::second_t m_period = 0_s;
 
   // True if this is a periodic event
   bool m_periodic = false;