Moved everything associated with executing and explaining queries to querytab.

It is now possible to create multiple independent query tabs. However
somethings are currently a bit broken.

util.cpp

@@ -0,0 +1,49 @@
+#include "util.h"
+
+// Supported range from microseconds to seconds
+// min:sec to hours::min::sec
+QString msfloatToHumanReadableString(float ms)
+{
+	QString unit;
+	float val;
+	int deci = 2;
+	if (ms < 1.0f) {
+		val = ms * 1000.f;
+		//result = QString::asprintf("%0.3f", ms * 1000.0f);
+		unit = u8"μs";
+	}
+	else if (ms >= 1000.0) {
+		val = ms / 1000.0f;
+		unit = "s";
+		if (val >= 60.0) {
+			int secs = val;
+			int min = secs / 60.0;
+			secs -= min * 60;
+			if (min >= 60) {
+				int hour = min / 60;
+				min -= hour * 60;
+				return QString::asprintf("%d:%02d:%02d", hour, min, secs);
+			}
+			else {
+				return QString::asprintf("%02d:%02d", min, secs);
+			}
+		}
+	}
+	else {
+		val = ms;
+		unit = "ms";
+	}
+
+//		if (val >= 1000.f) {
+//			deci = 0;
+//		}
+//		else
+	if (val >= 100.f) {
+		deci = 0;
+	}
+	else if (val >= 10.f) {
+		deci = 1;
+	}
+	QString result = QString::asprintf("%0.*f", deci, val);
+	return result + unit;
+}