ENYO-1921: Replaced home-made date picker with generic name picker based on FlyweightPicker kind.

Issue
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The home-made date picker was causing some confusion as it does not behave correctly in terms of adjusting days for the given month.

Fix
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The home-made date picker has been replaced with a generic name picker that still demonstrates the `FlyweightPicker` kind, retrieving values from an array of JavaScript library/framework names (and creating some names on the fly if the picker count is greater than the array length).

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>