added benchmark util

src/util/benchmark.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <QDebug>
+#include <QElapsedTimer>
+
+#define BENCH(x)     \
+    QElapsedTimer x; \
+    x.start();
+
+#define MARK(x) \
+    qDebug() << __FILE__ << __LINE__ << static_cast<float>(x.nsecsElapsed()) / 100000.0 << "ms";