Description
This renderer directly generates and outputs form HTML. It is based on pre-3.0 built-in
form output logic.
The renderer has built-in templates for elements, their format is similar to that of
HTML_Template_Sigma
or HTML_Template_IT (but only placeholders and blocks are supported). When renderer's
renderSomething() method is called, it finds the template for the element, makes necessary
substitutions and appends the result to the form's HTML.