WIP: [Obsolete] Integration of requirements checker plugin#1074

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starsandspirals wants to merge 8 commits intogoogle:masterfrom

starsandspirals:master

Commits on Jul 30, 2019

Moved notUsed rule to be checked after renaming
Daniel Marshall
committed

Commits on Jul 31, 2019

Fixed requirements checker bug where diagnostics were not being output
Daniel Marshall
committed

Commits on Aug 8, 2019

Removed old requirements checker and started integration of the plugin version
Daniel Marshall
committed
Merge remote-tracking branch 'refs/remotes/upstream/master'
Daniel Marshall
committed

Commits on Aug 9, 2019

Added installation of ghc-api-ghcjs to install.sh
Daniel Marshall
committed

Commits on Aug 12, 2019

Merge remote-tracking branch 'refs/remotes/upstream/master'
Daniel Marshall
committed
Fixed ghc-lib-parser version bounds and brought back compiler framework code
Daniel Marshall
committed
Fixed conditionals in requirements checker cabal file for GHCJS
Daniel Marshall
committed