Remove uu.py and test_uu.py (RustPython#5607)

* Remove uu.py and test_uu.py

* patch email.message

add os support modules

Use with instead of env for actions-gh-pages

_ctypes pt. 3 (RustPython#5530)

* Initial CFuncPtr implementation

* function calling via libffi

* working no-arg function call

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

update license dates

update license dates

update license dates

update license dates

update license dates

add constants and implement functions

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>