Pull UI from the library and into UIKit

[joshbruce]

Describe the feature

Working on registration and authentication patterns for other sites.

I would like to pull the UI part of this library. A year view and a month view. Or, possibly something more generic.

A calendar with type() might be worth exploring.

UIKit::calendar()->month();

UIK::calendar()->year();

If other view types are introduced they could easily be added. Want to continue avoiding using constants.

Might also allow further configuration related to the header mainly:

// defaults to true, true
UIKit::calendar()->nextAndPrevious(true, false);

// defaults to false
UIKit::calendar()->selectMonth();

// defaults to false
UIKit::calendar()->selectYear();

Why is this feature necessary?

I would like to see the primary purpose of this library as being the data handler portion rather than the UI portion.

Describe alternatives you've considered

Leave it as-is, which seems to hinder updating or gaining full understanding in one sitting.