Rewrite printing timestamps in znc -D

Previous commit doing it was 0f739de2c0

src/ZNCDebug.cpp

@@ -7,6 +7,9 @@
  */
 
 #include <znc/ZNCDebug.h>
+#include <iostream>
+#include <sys/time.h>
+#include <stdio.h>
 
 bool CDebug::stdoutIsTTY = true;
 bool CDebug::debug =
@@ -15,3 +18,17 @@ bool CDebug::debug =
 #else
 		false;
 #endif
+
+CDebugStream::~CDebugStream() {
+	timeval tTime;
+	gettimeofday(&tTime, NULL);
+	time_t tSec = (time_t)tTime.tv_sec; // some systems (e.g. openbsd) define tv_sec as long int instead of time_t
+	tm tM;
+	tzset();// localtime_r requires this
+	localtime_r(&tSec, &tM);
+	char sTime[20] = {};
+	strftime(sTime, sizeof(sTime), "%Y-%m-%d %H:%M:%S", &tM);
+	char sUsec[7] = {};
+	snprintf(sUsec, sizeof(sUsec), "%06lu", (unsigned long int)tTime.tv_usec);
+	std::cout << "[" << sTime << "." << sUsec << "] " << CString(this->str()).Escape_n(CString::EDEBUG) << std::endl;
+}