unique_ptr & shared_ptr: Added missing bool operator!()

seems like the explicit deepcopy helpers in the control flow state objects are no longer needed but crash the compiler due to infinite recursion

fix crash where Coroutine deallocation could execute Python code to print a warning which could trigger GC and hit the dead Coroutine object

hopefully fix crash where Coroutine deallocation could execute Python code to print a warning which could trigger GC and hit the dead Coroutine object

exclude optimised builtin methods from being the Python method call optimisation (previously broke code generation)

disable syntax support for "yield" expressions in function argument annotations and default args which never worked and crashes the compiler

This solves the issue reported by Volker Braun where conflicting
using aliases of uint64_t would result in compile time errors.

Unfortunately, this also means that it's always included if
CYTHON_USE_PYLONG_INTERNALS is set, but it's a short header.

- comma at end of any argument list (even in lambdas)
- "yield from" does not accept implicit tuple arguments

- comma at end of any argument list (even in lambdas)
- "yield from" does not accept implicit tuple arguments

disable syntax support for "yield" expressions in function argument annotations and default args which never worked and crashes the compiler