Integrate the monitor's listener socket into the shard's poll()

This removes the need for a separate monitor thread.

src/main.cpp

@@ -38,8 +38,6 @@
 CNShardServer *shardServer = nullptr;
 std::thread *shardThread = nullptr;
 
-std::thread *monitorThread = nullptr;
-
 void startShard(CNShardServer* server) {
     server->start();
 }
@@ -104,7 +102,6 @@ int main() {
     TransportManager::init();
     BuddyManager::init();
     GroupManager::init();
-    Monitor::init();
     Database::open();
 
     switch (settings::EVENTMODE) {
@@ -123,7 +120,6 @@ int main() {
     shardServer = new CNShardServer(settings::SHARDPORT);
 
     shardThread = new std::thread(startShard, (CNShardServer*)shardServer);
-    monitorThread = new std::thread(Monitor::start, nullptr);
 
     loginServer.start();