fix: Changed some code to be cross platform

Changed some code to be cross platform.

src/wallet/wallet_rpc_server.cpp

@@ -3383,15 +3383,11 @@ namespace tools
   }
   //------------------------------------------------------------------------------------------------------------------------------
 
-#define get_current_UTC_time(current_date_and_time,current_UTC_date_and_time) \
-time(&current_date_and_time); \
-gmtime_r(&current_date_and_time,&current_UTC_date_and_time);
-
 void sync_minutes_and_seconds(const int SETTINGS)
 {
   // Variables
-  time_t current_date_and_time;
-  struct tm current_UTC_date_and_time;
+  std::time_t current_date_and_time;
+  std::tm* current_UTC_date_and_time;
 
   std::cout << "Waiting until the next valid data interval, this will be less than 5 minutes";
 
@@ -3401,23 +3397,25 @@ void sync_minutes_and_seconds(const int SETTINGS)
 
     do
     {
-      nanosleep((const struct timespec[]){{0, 200000000L}}, NULL);
-      get_current_UTC_time(current_date_and_time,current_UTC_date_and_time);
-    } while (current_UTC_date_and_time.tm_min % BLOCK_TIME != 2 && current_UTC_date_and_time.tm_min % BLOCK_TIME != 3); 
+      std::this_thread::sleep_for(std::chrono::milliseconds(200));
+      current_date_and_time = std::time(0);
+      current_UTC_date_and_time = std::gmtime(&current_date_and_time);
+    } while (current_UTC_date_and_time->tm_min % BLOCK_TIME != 2 && current_UTC_date_and_time->tm_min % BLOCK_TIME != 3);  
   }
   else
   {
     std::cout << "Waiting until the next valid data interval, this will be at the beginning of the hour";
 
     do
     {
-      nanosleep((const struct timespec[]){{0, 200000000L}}, NULL);
-      get_current_UTC_time(current_date_and_time,current_UTC_date_and_time);
-    } while (current_UTC_date_and_time.tm_min != 2); 
+      std::this_thread::sleep_for(std::chrono::milliseconds(200));
+      current_date_and_time = std::time(0);
+      current_UTC_date_and_time = std::gmtime(&current_date_and_time);
+    } while (current_UTC_date_and_time->tm_min != 2); 
   }
 
   // wait a few more seconds due to not all clocks being synced at the same second
-  sleep(3);
+  std::this_thread::sleep_for(std::chrono::milliseconds(3000));
   return;
 }
 
@@ -3474,7 +3472,7 @@ bool wallet_rpc_server::on_vote(const wallet_rpc::COMMAND_RPC_VOTE::request& req
   for (count = 0; string.find("|") == std::string::npos && count < MAXIMUM_CONNECTION_TIMEOUT_SETTINGS; count++)
   {
     string = send_and_receive_data(network_data_nodes_list.network_data_nodes_IP_address[(int)(rand() % NETWORK_DATA_NODES_AMOUNT)],MESSAGE,SOCKET_CONNECTION_TIMEOUT_SETTINGS);
-    sleep(1);
+    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
   }
 
   if (count == MAXIMUM_CONNECTION_TIMEOUT_SETTINGS)
@@ -3636,7 +3634,7 @@ bool wallet_rpc_server::on_delegate_register(const wallet_rpc::COMMAND_RPC_DELEG
   for (count = 0; string.find("|") == std::string::npos && count < MAXIMUM_CONNECTION_TIMEOUT_SETTINGS; count++)
   {
     string = send_and_receive_data(network_data_nodes_list.network_data_nodes_IP_address[(int)(rand() % NETWORK_DATA_NODES_AMOUNT)],MESSAGE,SOCKET_CONNECTION_TIMEOUT_SETTINGS);
-    sleep(1);
+    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
   }
 
   if (count == MAXIMUM_CONNECTION_TIMEOUT_SETTINGS)
@@ -3828,7 +3826,7 @@ bool wallet_rpc_server::on_delegate_update(const wallet_rpc::COMMAND_RPC_DELEGAT
   for (count = 0; string.find("|") == std::string::npos && count < MAXIMUM_CONNECTION_TIMEOUT_SETTINGS; count++)
   {
     string = send_and_receive_data(network_data_nodes_list.network_data_nodes_IP_address[(int)(rand() % NETWORK_DATA_NODES_AMOUNT)],MESSAGE,SOCKET_CONNECTION_TIMEOUT_SETTINGS);
-    sleep(1);
+    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
   }
 
   if (count == MAXIMUM_CONNECTION_TIMEOUT_SETTINGS)