Update scroll calendar

[wildeyedskies]

The scroll calendar library is way out of date, but to update it the styling code will need to change around.

[precambrien]

Hi ! Thanks for the app.
I am considering adding the ovulation day to the calendar view with a different color than periods days. It seems to me that the ScrollCalendar widget doesn't allow to have several types of selected days and to set colors accordingly.
I am thinking about trying kizitonwose/CalendarView since you were planning to update the actual one, but I'll be glad to have your insights on this. Thank you !