[issue32030] Rewrite Py_Main()

Change by STINNER Victor : -- keywords: +patch pull_requests: +4347 stage: -> patch review ___ Python tracker ___

[issue32030] Rewrite Py_Main()

New submission from STINNER Victor : Python has a lot of code for its initialization. It's very hard to touch this code without risking to break something. It's hard to move code since many parts of the code are interdepent. The code rely on global "Py_xxx"