…beMethodBase contains no method

they are no longer needed as ClassBase instances no longer hold Python references to themselves

…ype instances, unless they are per-alloc call

no problem though - they will be collected by .NET garbage collector eventually

…cted directly instead.

Also fixes event_rename domain reload test case

it should not be possible to construct an instance of a class that has been unloaded

removed debug code, that ensured Python GC list integrity

… to allow them to be garbage collected

…ht shut down and unload corresponding methods before Python terminates