Elm_spinner focus UI, accessibility fix

Elm_spinner focus UI, accessibility fix

Summary:
Issue: Focus was not getting transferred individually on arrow buttons and text area.
Solution: Remove the usage of image parts and text parts and replace them with buttons
so as to handle the focus transfer normally than forcibly via smart event.
hence Focus next hook and focus direction hook is implemented.

Signed-off by: Subodh Kumar<s7158.kumar@samsung.com>
Signed-off by: Shilpa Singh<shilpa.singh@samsung.com>

Test Plan:
Use keyboard keys on spinner and test focus transfer, enable accessibility and test
accessibility.

Reviewers: woohyun, Hermet, shilpasingh, raster, seoz

Reviewed By: shilpasingh, raster

Subscribers: stefan_schmidt, raster, rajeshps, govi

Differential Revision: https://phab.enlightenment.org/D1911