Dhall.Import refactorings
          #2646
        
          
      
                
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This PR includes the following changes:
Use more lenses in
Dhall.Importand friends. My hope is that we can ultimately move to a MTL approach inDhall.Import, i.e. use(MonadIO m, MonadState Status m) => m ainstead ofStateT Status IO a.I moved
EvaluateSettingsandInputSettingsto a new (internal) moduleDhall.Settings. This enables us to have a field_evaluateSettings :: EvaluateSettingsinDhall.Import.Types.Status, since we need all the fields ofEvaluateSettingsduring import resolution anyway.A new
HasInputSettingsclass similiar toHasEvaluateSettings. The functions for the different phases in theDhallmodule now take a value ofHasInputSettings s => sinstead ofInputSettingsaccordingly.