Windows support

app/ghcup-gen/Validate.hs

app/ghcup/BrickMain.hs

app/ghcup/Main.hs

cabal.project

ghcup-0.0.4.yaml

ghcup.cabal

lib/GHCup.hs

lib/GHCup/Download.hs

lib/GHCup/Download/IOStreams.hs

lib/GHCup/Errors.hs

lib/GHCup/Platform.hs

lib/GHCup/Types.hs

lib/GHCup/Types/JSON.hs

lib/GHCup/Utils.hs

lib/GHCup/Utils/Dirs.hs

lib/GHCup/Utils/File.hs

lib/GHCup/Utils/File/Common.hs

lib/GHCup/Utils/File/Posix.hs

lib/GHCup/Utils/File/Windows.hs

lib/GHCup/Utils/Logger.hs