add SIGTERM handler

src/main.cpp

@@ -3,11 +3,16 @@
 #include "util/command_line.hpp"
 #include "debug/Logger.hpp"
 
+#include <csignal>
 #include <iostream>
 #include <stdexcept>
 
 static debug::Logger logger("main");
 
+static void sigterm_handler(int signum) {
+    Engine::getInstance().quit();
+}
+
 int main(int argc, char** argv) {
     CoreParameters coreParameters;
     try {
@@ -18,6 +23,7 @@ int main(int argc, char** argv) {
         std::cerr << err.what() << std::endl;
         return EXIT_FAILURE;
     }
+    std::signal(SIGTERM, sigterm_handler);
     
     debug::Logger::init(coreParameters.userFolder.string()+"/latest.log");
     platform::configure_encoding();