Hamish Mackenzie 9e6820cc71 Add haskell-nix.project (and project') (#703) ...

Generalized version of the `cabalProject` and `stackProject`
functions.

Automatically selects the correct project type based on the
`projectFileName` argument if provided or what files exist in
the `src` directory if no `projectFileName` was specified.

If it cannot be determined which it should use the following
error message is given:

```
error: haskell-nix.project : both `stack.yaml` and `cabal.project` files exist set `projectFileName = "stack.yaml;"` or `projectFileName = "cabal.project";`
```

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..

src

test: Fails to use snapshot.yaml (#338)

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.gitignore

test: Fails to use snapshot.yaml (#338)

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default.nix

Add haskell-nix.project (and project') (#703)

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package.yaml

test: Fails to use snapshot.yaml (#338)

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snapshot.yaml

test: Fails to use snapshot.yaml (#338)

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stack.yaml

test: Fails to use snapshot.yaml (#338)

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