start moving core frameworks to external libraries

app/widget/timelinewidget/tool/slip.cpp

@@ -22,7 +22,6 @@
 
 #include <QToolTip>
 
-#include "common/timecodefunctions.h"
 #include "config/config.h"
 #include "slip.h"
 #include "widget/timelinewidget/undo/timelineundogeneral.h"
@@ -58,10 +57,10 @@ void SlipTool::ProcessDrag(const TimelineCoordinate &mouse_pos)
   rational tooltip_timebase = parent()->GetTimebaseForTrackType(drag_start_.GetTrack().type());
   QToolTip::hideText();
   QToolTip::showText(QCursor::pos(),
-                     Timecode::time_to_timecode(time_movement,
-                                                tooltip_timebase,
-                                                Core::instance()->GetTimecodeDisplay(),
-                                                true),
+                     QString::fromStdString(Timecode::time_to_timecode(time_movement,
+                                                                       tooltip_timebase,
+                                                                       Core::instance()->GetTimecodeDisplay(),
+                                                                       true)),
                      parent());
 }