0.1.3
Fix issues:
- Item not found caused by accessing unexisted vlines and xy points after closing a plot tab (remove them before the tab is deleted)
- Legends of new plots are not displayed (add plot legend in addPlotWithParent function)
- Removing elements in vlines and xypoints while iterating is not correct (use list comprehension instead)
- Closing tab while playing will cause
item not founderror (check if act_plot has been deleted by users before create new vlines and xy points)
Feature improvements:
- [timeline] Disable rendering if duration is zero
- [timeline_widget] Disable play callback function if duration is zero
- Reset vlines and xy points back to initial positions when playback is stopped