Introduce managed objects #728
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Managed objects derive from
parsec_object_tand provide a custom release function that can be set by the application. PaRSEC will fall back to callingfreeif no explicit callback is set. Managed objects are tied into the type system becausePARSEC_OBJ_RELEASEmust be able to distinguish them from regular objects. The most common managed object would beparsec_list_item_tas that is the basis for all container elements in PaRSEC and so we can register a release callback that stashes an object into a container from where it can be retrieved and reused later.This is an alternative to #726 . It's less intrusive but like #726 not ABI backwards compatible but does not change the API.