fix couple of list issues while deleting during item usage.
fix couple of list issues while deleting during item usage.

now list marks itself as "walking" every time it's usign wd->items,
this way any call to clear or deletion (elm_list_item_del()) will be
postponed using the wd->to_delete list.

please let me know of any bugs you may find.



SVN revision: 44124

FlorentRevest/Elementary,tasn/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,tasn/elementary