sppas.ui.swapp.app_setup: Added a SetupController(), toward a MVC architecture.
sppas.ui.swapp.app_setup: Migrated the update of the tree from SetupManager to SetupView
sppas.ui.swapp.app_setup: Removed SetupHeader. The SetupView() is creating the header.
sppas.ui.swapp.app_setup: the SetupView() is inheriting of swappBaseView()
sppas.ui.swapp: Created a swappBaseView() class
sppas.ui.swapp: debug of request.js -- when response is empty.
sppas.ui.swapp: updated Whakerexa for the links management
Added a LinkController() javascript class to control user interactions on clickable elements that open URLs.