crash: add crash stack print.

Server/main.cpp

@@ -1,10 +1,18 @@
-#include <QCoreApplication>
+#include <QCoreApplication>
+#include <Util.h>
 
 #include "Server.h"
-#include <Util.h>
 
 int main(int argc, char* argv[])
 {
+    auto configDir = Util::GetCurConfigPath("frelay");
+#ifdef _WIN32
+    backward::SetDumpFileSavePath(configDir + "/dumpfile");
+    backward::SetDumpLogSavePath(configDir + "/dumplog");
+#else
+    backward::SetDumpLogSavePath(configDir + QDir::separator() + "dumplog");
+#endif
+
     QCoreApplication app(argc, argv);
 
     Util::InitLogger("frelayServer.log", "frelayServer");