common: added function to convert any number to a hex string

Helps with debugging.

app/common/CMakeLists.txt

@@ -45,6 +45,7 @@ set(OLIVE_SOURCES
   common/timelinecommon.h
   common/timerange.h
   common/timerange.cpp
+  common/tohex.h
   common/xmlutils.h
   common/xmlutils.cpp
   PARENT_SCOPE

app/common/tohex.h

@@ -1,4 +1,16 @@
 #ifndef TOHEX_H
 #define TOHEX_H
 
+#include <QtGlobal>
+
+#include "common/define.h"
+
+OLIVE_NAMESPACE_ENTER
+
+inline QString ToHex(quint64 t) {
+  return QStringLiteral("%1").arg(t, 0, 16);
+}
+
+OLIVE_NAMESPACE_EXIT
+
 #endif // TOHEX_H