Support updating environment variables

[anki-code]

The idea:

1. Get prev_env = $(env) before running the sh-command
2. Run sh-command. Example ! export QWE=123.
3. Add saving env at the end of command: ! export QWE=123 ; env > /tmp/post_env.
4. By comparing prev_env and post_env update the environment in the current session i.e. $QWE='123'

For community

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