[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/cpp/frc2/command/WaitUntilCommand.cpp

@@ -4,7 +4,7 @@
 
 #include "frc2/command/WaitUntilCommand.h"
 
-#include "frc2/Timer.h"
+#include <frc/Timer.h>
 
 using namespace frc2;
 
@@ -12,7 +12,7 @@ WaitUntilCommand::WaitUntilCommand(std::function<bool()> condition)
     : m_condition{std::move(condition)} {}
 
 WaitUntilCommand::WaitUntilCommand(units::second_t time)
-    : m_condition{[=] { return Timer::GetMatchTime() - time > 0_s; }} {}
+    : m_condition{[=] { return frc::Timer::GetMatchTime() - time > 0_s; }} {}
 
 bool WaitUntilCommand::IsFinished() {
   return m_condition();