Planner Timetable with alarm f

Apr 9, 2020

version 1.5.0:
1. Memo has been added.
2. TODO widget has been added.
3. Timetable sharing has been improved.
4. Various bug fixes and ui updates.

version 1.4.7:
- Fixed the problem of rank list not working properly

version 1.4.6:
-0. Change Todo's notification logic
-1. Improved the phenomenon that the ranking does not count as of February 17

version 1.4.5:
- 1.Add TODO function
- 2.Fix bug that timetable is not deleted.
- 3. Fix various bugs.