Improve quality and information density of error message

[fendor]

Fixes #1509
Improves amount of information the error message gives.
Also aims to give: possible solutions, and teaching material.

[fendor]

Example error message:

Fail on initialisation for "/home/baldr/Documents/haskell/fprog/src/Angabe6.hs".
Could not obtain flags for: "src/Angabe6.hs".

This Module was not part of any component we are aware of.

Component: ChLibName ChMainLibName with source directory: ["src"]
Component: ChExeName "intcode" with source directory: ["app"]


If you dont know how to expose a module, take a look at:
https://www.haskell.org/cabal/users-guide/developing-packages.html

We could not build all components.
If one of these components exposes this Module, make sure they compile.
You can try to invoke the commands yourself.
The following commands failed:

callProcessStderr: cabal v2-build --with-ghc=/home/baldr/.nix-profile/bin/ghc --with-ghc-pkg=/home/baldr/.nix-profile/bin/ghc-pkg --with-haddock=/home/baldr/.nix-profile/bin/haddock --project-file=/home/baldr/Documents/haskell/fprog/cabal.project --builddir=/home/baldr/Documents/haskell/fprog/dist-newstyle --only-configure fprog:exe:fprog (exit 1): failed

callProcessStderr: cabal v2-build --with-ghc=/home/baldr/.nix-profile/bin/ghc --with-ghc-pkg=/home/baldr/.nix-profile/bin/ghc-pkg --with-haddock=/home/baldr/.nix-profile/bin/haddock --project-file=/home/baldr/Documents/haskell/fprog/cabal.project --builddir=/home/baldr/Documents/haskell/fprog/dist-newstyle --only-configure fprog:test:fprog-test (exit 1): failed

[lukel97]

This LGTM! Looking forward to having this in