Core/Server: Catch exceptions in int main()

The exceptions is rethrown on debug mode.

Ref Coverity CID 1010213, 1022574, 1227501, 1227502,
1227503, 1227504, 1227505, 1254536 and 1254612

src/server/bnetserver/Main.cpp

@@ -61,7 +61,7 @@ boost::asio::deadline_timer _dbPingTimer(_ioService);
 uint32 _dbPingInterval;
 LoginDatabaseWorkerPool LoginDatabase;
 
-int main(int argc, char** argv)
+int mainImpl(int argc, char** argv)
 {
     std::string configFile = _TRINITY_BNET_CONFIG;
     auto vm = GetConsoleArguments(argc, argv, configFile);
@@ -156,6 +156,23 @@ int main(int argc, char** argv)
     return 0;
 }
 
+int main(int argc, char** argv)
+{
+    try
+    {
+        return mainImpl(argc, argv);
+    }
+    catch (std::exception& ex)
+    {
+        std::cerr << "Top-level exception caught:" << ex.what() << "\n";
+
+#ifndef NDEBUG // rethrow exception for the debugger
+        throw;
+#else
+        return 1;
+#endif
+    }
+}
 
 /// Initialize connection to the database
 bool StartDB()