Replace std::lock_guard and std::lock with std::scoped_lock (#1758)

std::scoped_lock was introduced in C++17 and is strictly better than
std::lock_guard as it supports locking any number of mutexes safely.
It's also easier to use than std::lock for locking multiple mutexes at
once.

hal/src/main/native/sim/HAL.cpp

@@ -231,7 +231,7 @@ HAL_Bool HAL_Initialize(int32_t timeout, int32_t mode) {
   // Initial check, as if it's true initialization has finished
   if (initialized) return true;
 
-  std::lock_guard lock(initializeMutex);
+  std::scoped_lock lock(initializeMutex);
   // Second check in case another thread was waiting
   if (initialized) return true;