Updated how WidgetCalendar displays upcoming events.

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For 3-at-a-time view in WidgetCalendar:

• Display time for today's events.
• Display date according to month/day order of the watch.

For next-event view in WidgetCalendar:

• Do not display time for all-day events.
• Localized the display of "today" and "tomorrow."

In WidgetTime:

• Added class method for retrieval of Boolean preferences.