elm_scroller: add wheel_disable_set API
Summary:
This API can be used by widgets like Genlist/Gengrid, which implements
Elm_Interface_Scrollable interface.Mouse wheel is used to scroll up and
down on widget.
@feature
Test Plan: elementary_test -> Scroller -> Wheel Disable
Reviewers: raster, Hermet, cedric, SanghyeonLee, singh.amitesh
Subscribers: JackDanielZ, herdsman, cedric, sachin.dev
Differential Revision: https://phab.enlightenment.org/D2715
Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>