Replace std::cout and std::cerr with fmt::print() (#3519)

hal/src/dev/native/cpp/main.cpp

@@ -2,11 +2,11 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include "hal/HAL.h"
 
 int main() {
-  std::cout << "Hello World" << std::endl;
-  std::cout << HAL_GetRuntimeType() << std::endl;
+  fmt::print("Hello World\n");
+  fmt::print("{}\n", HAL_GetRuntimeType());
 }