Use stricter C++ type conversions (#4357)

Now, implicit narrowing conversions are only used with wpi::Now(). This
also fixes clang-tidy warnings about C-style casts. For example:
```
== clang-tidy /__w/allwpilib/allwpilib/wpilibNewCommands/src/main/native/include/frc2/command/SwerveControllerCommand.inc ==
/__w/allwpilib/allwpilib/wpilibNewCommands/src/main/native/include/frc2/command/SwerveControllerCommand.inc:95:18: warning: C-style casts are discouraged; use static_cast/const_cast/reinterpret_cast [google-readability-casting]
  auto curTime = units::second_t(m_timer.Get());
                 ^
```
In that case at least, the cast was removed entirely since Get() already
returns a units::second_t.

wpilibcExamples/src/main/cpp/commands/profiledpidcommand/ReplaceMeProfiledPIDCommand.cpp

@@ -11,13 +11,15 @@
 // For more information, see:
 // https://docs.wpilib.org/en/stable/docs/software/commandbased/convenience-features.html
 ReplaceMeProfiledPIDCommand::ReplaceMeProfiledPIDCommand()
-    : CommandHelper(
+    : CommandHelper{
           // The ProfiledPIDController that the command will use
-          frc::ProfiledPIDController<units::meters>(
+          frc::ProfiledPIDController<units::meters>{
               // The PID gains
-              0, 0, 0,
+              0,
+              0,
+              0,
               // The motion profile constraints
-              {0_mps, 0_mps_sq}),
+              {0_mps, 0_mps_sq}},
           // This should return the measurement
           [] { return 0_m; },
           // This should return the goal state (can also be a constant)
@@ -28,7 +30,7 @@ ReplaceMeProfiledPIDCommand::ReplaceMeProfiledPIDCommand()
           [](double output,
              frc::TrapezoidProfile<units::meters>::State setpoint) {
             // Use the output and setpoint here
-          }) {}
+          }} {}
 
 // Returns true when the command should end.
 bool ReplaceMeProfiledPIDCommand::IsFinished() {