Add shouldSelect option in togglePresentedDate method

[yoobato]

Add shouldSelect option parameter in togglePresentedDate method.
This determines whether selectDayViewWithDay method where is in the end of togglePresentedDate method should be called or not.

I set true as default value for shouldSelect to support legacy codes.

AS-IS (CVCalendarContentViewController)
@objc public func togglePresentedDate(_ date: Foundation.Date) { }

TO-BE
@objc public func togglePresentedDate(_ date: Foundation.Date, shouldSelect: Bool = true) { }

This may helps #251 although it's closed.

[stale]

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