Check-It-Off Checklist App

Invalid date

Version 2.10.0 and 2.11.0 include:
- Add a new checklist item to the top of the checklist
- For date sorting, sort checklist items with dates ahead of items without dates
- Added setting for text size small/medium/large, with default medium
- Initialize the date/time picker with pre-selected values
- Cancel a checklist item's pending notification when item is deleted
- Added vertical scrollbar to list of checklists and checklists
- Internal code improvements and bug fixes