[pull] l2d from carpentries:main (#45)

* Open new episodes for editing in interactive sessions

* enforce lf line ending for shim

* skip snapshot test on non-utf-8 compatible windows

* use explicit return

* update NEWS

* sprinkle open args through create_episode family

* make sure create_episode() behaves in examples

That is, make sure it does not accidentally open a file when
lessons are being created or when running examples.

* silence create_episode() msg in tests

We have the tests to ensure the basic functionality works and we know
that usethis is testing for the messaging funcationality, we do not need
to further test it and it is better to silence the messages than test
for them.

---------

Co-authored-by: Milan Malfait <[email protected]>
Co-authored-by: Zhian N. Kamvar <[email protected]>