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focus: add the APIs to set the focus next about item.

Description

focus: add the APIs to set the focus next about item.

Add elm_object_focus_next_item_set/get,
elm_object_item_focus_next_object_set/get and
elm_object_item_focus_next_item_set/get.

If the item and object is set at the same time,
the item is preference to object when the focus moves.

This feature is implemented about gengrid.
It will be implemented about ohter widgets.

@feature