model.base: add item_id_{set,del}_hook
to NamespaceSet
#132
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These hooks allow dynamically assigning a value to the identifying
attribute of an object whenever it is added to a
NamespaceSet
(
item_id_set_hook
). Furthermore, theitem_id_del_hook
allowsunsetting the identifying attribute whenever an object is removed
from a
NamespaceSet
.This functionality is necessary for the implementation of
SubmodelElementLists
, because there we need to store items withoutan identifying attribute in a
NamespaceSet
.This PR depends on #130.