In current Efl.Ui.View_list,
if we add 1000 children in the model,
widget itself cannot be launched in the efl_ui_viewlist_example_01.c
we need to improve and optimize performance in model and efl.Ui.View_List,
especially size_calculation of each items need to be improved for normal usages.
using item instead of layout can be one good solution.
efl.ui.layout_object will evaluate their own size by given edje,
so we cannot optimize item calcalation proper times.