add lua engine, lua file, server, client, vehicle data, other stuff

include/RWMutex.h

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+// Author: lionkor
+#pragma once
+
+/*
+ * An RWMutex allows multiple simultaneous readlocks but only one writelock at a time,
+ * and write locks and read locks are mutually exclusive.
+ */
+
+#include <shared_mutex>
+
+// Use ReadLock(m) and WriteLock(m) to lock it.
+using RWMutex = std::shared_mutex;
+// Construct with an RWMutex as a non-const reference.
+// locks the mutex in lock_shared mode (for reading). Locking in a thread that already owns a lock
+// i.e. locking multiple times successively is UB. Construction may be blocking. Destruction is guaranteed to release the lock.
+using ReadLock = std::shared_lock<RWMutex>;
+// Construct with an RWMutex as a non-const reference.
+// locks the mutex for writing. Construction may be blocking. Destruction is guaranteed to release the lock.
+using WriteLock = std::unique_lock<RWMutex>;