Removed last big change to have a global static
ItemControlBlock registry. Thought about things
and what is needed/wanted is RTTI for the Items.
Instead of using typeid(T).hash_code() it is
equally possible to use the ItemControlBlock of
each Item - it exists once as global static
instance. So use it's address. That way e.g. the
ItemSet holding it *will* hjave a direct reference
to the ItemControlBlock, so no need for a global
registration.
Checked, tested, adapted, works.

Change-Id: I4c9b6bfe4ba6858b234238d6125793378574af87