[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.

wpilibOldCommands/src/main/native/cpp/commands/WaitUntilCommand.cpp

@@ -8,12 +8,12 @@
 
 using namespace frc;
 
-WaitUntilCommand::WaitUntilCommand(double time)
+WaitUntilCommand::WaitUntilCommand(units::second_t time)
     : Command("WaitUntilCommand", time) {
   m_time = time;
 }
 
-WaitUntilCommand::WaitUntilCommand(std::string_view name, double time)
+WaitUntilCommand::WaitUntilCommand(std::string_view name, units::second_t time)
     : Command(name, time) {
   m_time = time;
 }