Lukas Kalbertodt 49828fc2e3 Change API of parse_env functions ...

I think this is an overall improvement. A few things done here:
- They are available as `::env::parse` instead of `::env_utils`. The
  `env` module gets functions of its own soon enough.
- Renamed functions to be shorter: `list_by_sep`, `list_by_comma`, ...
- The docs were adjusted. One example is enough. And the functions with
  a fixed separator don't need the full docs again. That way we can
  avoid the `paste` dependency.
- Functions now always return `Result<C, _>`. While the previous version
  was slightly more flexible, I don't think anyone would benefit from
  that flexibility (as `parse_env` requires `Result<_, _>` anyway) and
  this way it's a bit clearer what the function does, especially for
  those who don't know the nifty `FromIterator for Result` impl.
- The example was adjusted accordingly. I also changed the names to
  obviously dummy names as I didn't know the existing names and don't
  want to spend time investigating whether I want their names in my
  code base :D

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..

files

Update example

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parse_env.rs

Change API of parse_env functions

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simple.rs

Format code

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