Big f***ing cleanup part 1

tests/Engine/Network/TCP.cpp

@@ -1,10 +1,11 @@
-#include <Nazara/Core/Thread.hpp>
 #include <Nazara/Math/Vector3.hpp>
 #include <Nazara/Network/NetPacket.hpp>
 #include <Nazara/Network/TcpClient.hpp>
 #include <Nazara/Network/TcpServer.hpp>
 #include <Catch/catch.hpp>
+#include <chrono>
 #include <random>
+#include <thread>
 
 SCENARIO("TCP", "[NETWORK][TCP]")
 {
@@ -29,7 +30,7 @@ SCENARIO("TCP", "[NETWORK][TCP]")
 		Nz::IpAddress clientIP = client.GetRemoteAddress();
 		CHECK(clientIP.IsValid());
 
-		Nz::Thread::Sleep(100);
+		std::this_thread::sleep_for(std::chrono::milliseconds(100));
 
 		Nz::TcpClient serverToClient;
 		REQUIRE(server.AcceptClient(&serverToClient));