Add player limit bypass to onPlayerAuth (#372)

With this PR, returning 2 in onPlayerAuth will allow the player to join
without checking if the server is full. This makes it easier for plugin
developers to allow for example their staff to join without having to
change the max player count.

src/TNetwork.cpp

@@ -385,10 +385,21 @@ std::shared_ptr<TClient> TNetwork::Authentication(TConnection&& RawConnection) {
 
     auto Futures = LuaAPI::MP::Engine->TriggerEvent("onPlayerAuth", "", Client->GetName(), Client->GetRoles(), Client->IsGuest(), Client->GetIdentifiers());
     TLuaEngine::WaitForAll(Futures);
-    bool NotAllowed = std::any_of(Futures.begin(), Futures.end(),
-        [](const std::shared_ptr<TLuaResult>& Result) {
-            return !Result->Error && Result->Result.is<int>() && bool(Result->Result.as<int>());
-        });
+    bool NotAllowed = false;
+    bool BypassLimit = false;
+
+    for (const auto& Result : Futures) {
+        if (!Result->Error && Result->Result.is<int>()) {
+            auto Res = Result->Result.as<int>();
+
+            if (Res == 1) {
+                NotAllowed = true;
+                break;
+            } else if (Res == 2) {
+                BypassLimit = true;
+            }
+        }
+    }
     std::string Reason;
     bool NotAllowedWithReason = std::any_of(Futures.begin(), Futures.end(),
         [&Reason](const std::shared_ptr<TLuaResult>& Result) -> bool {
@@ -421,7 +432,7 @@ std::shared_ptr<TClient> TNetwork::Authentication(TConnection&& RawConnection) {
 
     if (!Allowed) {
         return {};
-    } else if (mServer.ClientCount() < size_t(Application::Settings.getAsInt(Settings::Key::General_MaxPlayers))) {
+    } else if (mServer.ClientCount() < size_t(Application::Settings.getAsInt(Settings::Key::General_MaxPlayers)) || BypassLimit) {
         beammp_info("Identification success");
         mServer.InsertClient(Client);
         TCPClient(Client);