reimplement cross-closure type inference using a dedicated LocalEntry class for entry copies in closures to keep closure knowledge in one place

prevent InlinedDefNodeCallNode from being considered 'simple' by making CallNode generally non-simple

analyse loop variable in scoped comprehensions as local variable (enables control flow based optimisations)

Fix __Pyx_ImportType if #Py_LIMITED_API is defined.

Fix first example in memoryview docs

prevent special __weakref__ attribute from triggering generation of garbage collection code for the type

--HG--
rename : tests/run/function_as_method_T494.pyx => tests/run/function_as_method_py_T494.py