Some refactoring

Some refactoring

Separate Modules.Auth, and also Settings -> Extensions/*.

Affected files:
Blog/Extensions/Context.hs
Blog/Extensions/FormProcessors.hs
Blog/Extensions/Handlers.hs
Blog/Extensions/Middlewares.hs
Blog/Extensions/Signals.hs
Framework/Exceptions.hs
Framework/Forms/Validation.hs
Framework/Http/Middlewares.hs
Framework/Modules/Auth/Context.hs
Framework/Modules/Auth/Handlers.hs
Framework/Modules/Auth/ShowForm.hs
Framework/Signals.hs
Framework/Urls.hs
Framework/Utils.hs