Update login forms and lib users/Auth

* One form for login and admin/login used
* Re-confirm login on admin/login if user logged in, otherwise presents default login-form
Update config routes for login forms
Update core/Admin_Controller to check for logged_in_admin
Merge branch 'feature/users' into develop
Fix typo in config/autoload.sample
Update core/ICF_Model to check for empty prepped data
Layout fix of lang english/icf_button
Update module users to allow sending new confirmation code
Merge branch 'feature/users' into develop