reference naming conflict resolution from C++ wrapping doc, show how to wrap C++ objects in cdef class attributes

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extra : transplant_source : %FE%A5%0B%83%D2%A8d%B01w%1C%3C%C8%A6%ED%FE%19%3D%00%FE

fix temp leak and crash when assigning a C value to both a Python and C target in a cascaded assignment

This seems to have been a mis-understanding on how C++ works/is wrapped.

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extra : transplant_source : %87%E8%C9%0A%B8%1A%C34%26H%B8%0F%89%D4%8CC%10%1A%0F%84

Also, remove clock_t from posix.types making users find it in libc.time.  It's
really a standard C type and not used anywhere in system interfaces anyway.

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extra : transplant_source : %8D%3C%FBM%FFf%98u%AB%8E.%A1vQhE%E7z%DC%83

Move std C time APIs to libc.time; Move posix.sys_time to simply posix.time for system-level things like timer_* clock_*.

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