python: Make all CppOwnedPyObjects and similar support garbage collection.

If you want to subclass apt_pkg.Cache() and create an apt_pkg.DepCache()
object in it (e.g. as self.depcache) this is needed because otherwise,
Python would not know about the cyclic dependency and refuse to free any
of them.

This also changes apt_pkg.Cache to the standard deallocation schema,
because the underlying CacheFile deletes its pointers automatically on
deletion. Thus a second call is not needed.

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