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cabal2nix: split into a lightweight version and a wrapper
Current, the `cabal2nix` derivation contains both the executable, and a wrapper that adds `nix` and `nix-prefetch-scripts`, which are required for some features. However, when calling `callCabal2nix` to create a derivation from a cabal file at evaluation time, these features are not actually used, but the huge closure of `nix-prefetch-scripts` (which includes multiple vcs, as well as python and perl) still needs to be fetched. This commit splits cabal2nix into a lightweight version that is a standalone static binary (`cabal2nix-unwrapped`), and a wrapper that includes the proper dependencies in the path for full usage of the command line utility (`cabal2nix`). This commit also switches to the default ghc, to reduce the likelyhood of building a different ghc when calling `callCabal2nix`.
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