rust-cpython: add safe wrapper representing shared data borrowed from PyObject
PySharedRef is a tempoary wrapper around PySharedRefCell. It provides safe
functions for each shared data. $shared_accessor implements a safe method
to construct PySharedRefCell.
This allows us to add more than once PySharedRefCell to a Python object.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false