Remove Controller\Error::add method.
Remove View\Form::output method.
rename View\Error::display_error method to display.
Rename Model\Section class to Model\FormSection.
Rename View\FormField::output method to display.
Add View\FormSection and Controller\FormSection class.
Add Controller\Form::add and load_template method.
Add Controller\FormField:add method.
Add additional properties to Model\Form class.
Add Model\FormField::is_valid method.
Add class value within Model\TextFormField::__construct method.
Update how error is set in Model\Page class.