Add support for fish shell and continue adding support for non-posix compliant shells. #2995
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Closes #478.
This further contributes to Jubilee Young's efforts to add support for non-posix compliant shells by adding
add_to_path
andremove_from_path
methods to the UnixShell trait. This removes the bulk of code from unix.rs.As part of this, support for fish shell is also added by writing to $HOME/.config/fish/conf.d/cargo.fish as recommended by fish shell issue 3170.
Any recommendations for further tests and changes to how the fish path should be handled are welcome.