add persistent lobby flag

Lobby.hh

@@ -20,6 +20,7 @@ enum LobbyFlag {
   QuestInProgress = 0x10, // game only
   JoinableQuestInProgress = 0x20, // game only
   Default = 0x40, // lobby only; false for private lobbies
+  Persistent = 0x80, // if not set, lobby is deleted when empty
 };
 
 struct Lobby {

ReceiveCommands.cc

@@ -755,7 +755,7 @@ void process_menu_selection(shared_ptr<ServerState> s, shared_ptr<Client> c,
   }
 }
 
-void process_change_lobby(shared_ptr<ServerState> s, shared_ptr<Client> c, 
+void process_change_lobby(shared_ptr<ServerState> s, shared_ptr<Client> c,
     uint16_t command, uint32_t flag, uint16_t size, const void* data) { // 84
   struct Cmd {
     uint32_t menu_id;

ServerState.cc

@@ -22,7 +22,8 @@ ServerState::ServerState() : run_dns_server(true), run_interactive_shell(true),
   for (size_t x = 0; x < 20; x++) {
     auto lobby_name = decode_sjis(string_printf("LOBBY%zu", x + 1));
     shared_ptr<Lobby> l(new Lobby());
-    l->flags |= LobbyFlag::Public | LobbyFlag::Default | ((x > 14) ? LobbyFlag::Episode3 : 0);
+    l->flags |= LobbyFlag::Public | LobbyFlag::Default | LobbyFlag::Persistent |
+        ((x > 14) ? LobbyFlag::Episode3 : 0);
     l->block = x + 1;
     l->type = x;
     char16cpy(l->name, lobby_name.c_str(), 0x24);