efl_ui_panel: remove dependency with elm_interface_scrollable
elm_interface_scrollable is replaced with efl_ui_scrollable_interative.
Legacy code related to SCROLL event is removed because eo SCROLL event have
void event info.
in lib/efl/inferfaces/efl_ui_scrollable.eo scroll: void; [[Called when scrolling]]
I think we need to add new PANEL_SCROLL event that have Efl_Ui_Panel_Scroll_Info
Reviewed-by: Marcel Hollerbach <email@example.com>
Differential Revision: https://phab.enlightenment.org/D9637