BHV-9320: Corrected PagingControl hover/pressed behavior

* Corrected PagingControl hover/pressed behavior
* Simplified IconButton CSS (refactored)
* Incorporated GroupButton spotlight/hover fix (#1350)
* Corrected no-background class behavior
* Added support to moon.Icon to receive disabled style when inside a container which is disabled.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>