Added check for Stateview, added socket cancel to finish all connect, send and receive operations immediately

Add ENV for missing settings.

Issue: https://github.com/BeamMP/BeamMP-Server/issues/414

Please let me know if there are any issues.

---

By creating this pull request, I understand that code that is AI
generated or otherwise automatically generated may be rejected without
further discussion.
I declare that I fully understand all code I pushed into this PR, and
wrote all this code myself and own the rights to this code.

src/Client.cpp

@@ -84,6 +84,7 @@ void TClient::Disconnect(std::string_view Reason) {
         if (ec) {
             beammp_debugf("Failed to shutdown client socket: {}", ec.message());
         }
+        mSocket.cancel();
         mSocket.close(ec);
         if (ec) {
             beammp_debugf("Failed to close client socket: {}", ec.message());

src/TConfig.cpp

@@ -62,7 +62,9 @@ static constexpr std::string_view StrPassword = "Password";
 
 // Misc
 static constexpr std::string_view StrHideUpdateMessages = "ImScaredOfUpdates";
+static constexpr std::string_view EnvStrHideUpdateMessages = "BEAMMP_IM_SCARED_OF_UPDATES";
 static constexpr std::string_view StrUpdateReminderTime = "UpdateReminderTime";
+static constexpr std::string_view EnvStrUpdateReminderTime = "BEAMMP_UPDATE_REMINDER_TIME";
 
 TEST_CASE("TConfig::TConfig") {
     const std::string CfgFile = "beammp_server_testconfig.toml";
@@ -263,8 +265,8 @@ void TConfig::ParseFromFile(std::string_view name) {
         TryReadValue(data, "General", StrLogChat, EnvStrLogChat, Settings::Key::General_LogChat);
         TryReadValue(data, "General", StrAllowGuests, EnvStrAllowGuests, Settings::Key::General_AllowGuests);
         // Misc
-        TryReadValue(data, "Misc", StrHideUpdateMessages, "", Settings::Key::Misc_ImScaredOfUpdates);
+        TryReadValue(data, "Misc", StrHideUpdateMessages, EnvStrHideUpdateMessages, Settings::Key::Misc_ImScaredOfUpdates);
-        TryReadValue(data, "Misc", StrUpdateReminderTime, "", Settings::Key::Misc_UpdateReminderTime);
+        TryReadValue(data, "Misc", StrUpdateReminderTime, EnvStrUpdateReminderTime, Settings::Key::Misc_UpdateReminderTime);
 
     } catch (const std::exception& err) {
         beammp_error("Error parsing config file value: " + std::string(err.what()));

src/TLuaEngine.cpp

@@ -43,6 +43,8 @@ static sol::protected_function AddTraceback(sol::state_view StateView, sol::prot
 static std::optional<sol::function> GetLuaHandler(sol::state_view StateView, const std::string Handler, const std::string EventName);
 
 static std::optional<sol::function> GetLuaHandler(sol::state_view StateView, const std::string Handler, const std::string EventName) {
+    if (!StateView)
+        return std::nullopt;
     auto Res = StateView.safe_script("return " + Handler, sol::script_pass_on_error);
     if (!Res.valid()) {
         beammp_errorf("invalid handler for event \"{}\". handler: \"{}\"", EventName, Handler);