Removing unused imports, fixing other -fwarn issues
Removing unused imports, fixing other -fwarn issues

franklx/IHaskell,artuuge/IHaskell,gibiansky/IHaskell,wyager/IHaskell,beni55/IHaskell,beni55/IHaskell,beni55/IHaskell,gibiansky/IHaskell,gibiansky/IHaskell,FranklinChen/IHaskell,sumitsahrawat/IHaskell,qzchenwl/IHaskell,qzchenwl/IHaskell,beni55/IHaskell,wyager/IHaskell,thomasjm/IHaskell,franklx/IHaskell,artuuge/IHaskell,thomasjm/IHaskell,wyager/IHaskell,kfiz/IHaskell,sumitsahrawat/IHaskell,thomasjm/IHaskell,artuuge/IHaskell,FranklinChen/IHaskell,franklx/IHaskell,qzchenwl/IHaskell,sumitsahrawat/IHaskell,franklx/IHaskell,qzchenwl/IHaskell,artuuge/IHaskell,FranklinChen/IHaskell,kfiz/IHaskell,kfiz/IHaskell,kfiz/IHaskell,FranklinChen/IHaskell,wyager/IHaskell,thomasjm/IHaskell