Prefer using std::this_thread::sleep over platform-specific sleeps

Author: urfeex

examples/dashboard_example.cpp

@@ -32,9 +32,7 @@
 
 #include <ur_client_library/log.h>
 #include <ur_client_library/ur/dashboard_client.h>
-#include <ur_client_library/comm/socket_t.h>
 
-#include <iostream>
 #include <memory>
 #include <thread>
 
@@ -100,11 +98,7 @@ int main(int argc, char* argv[])
     return 1;
   }
 
-#ifdef _WIN32
-  ::Sleep(1000);
-#else   // _WIN32
-  sleep(1);
-#endif  // _WIN32
+  std::this_thread::sleep_for(std::chrono::seconds(1));
 
   // Play loaded program
   if (!my_dashboard->commandPlay())