… ReminderDetailsView

… a new view; ReminderDateTimeView, and passed viewModel via the environment.

…nalAnimation to honour Accessibility setting

… with new enum, allowing animations of picker view transitions to be handled precisely with new function setPickerState.

No settings for transitions or animations work well (in a Form) when transitioning from a state where the date picker is shown, so use the setPickerState function to make transitions from a date picker shown state without animation, but animate all other view transitions.
There is now no janky animation whatsoever, but 2 out of the 6 possible transitions now happen without animation.

…pe if else formatting. Updated one instance of newvalue to newValue.

Removed unused Date functions and repositioned to end of file with additional commentary.
Moved definition of enum for PickerState into the class.

RemindersListViewModel.swift:
Removed unneeded delay in combine pipeline for removing blank entries.