M!69 - Use tabular numbers for any widgets that stack numbers
Widgets covered in this commit are:
- ECalendarItem
- ECellDateEdit
- ECellDateEditText
- ECellPercent
- ECellSize
- EDateEdit (the time picker part)
- EDayView (the times on the side)
- ETaskTable (the combo popup for the percent field)
- EToDoPane (the date headers)
- EWeekView/EMonthView (the day numbers)
Closes https://gitlab.gnome.org/GNOME/evolution/-/merge_requests/69
(Previously: !62 (merged))