[Dillo-dev] [patch]: simplify a_Html_form_event_handler(): part II

More simplification of form handling. Several functions that used an index to an input in the form's input list have been changed to use a pointer to the input, which removed some useless indirection. This enabled refactoring the code in a_Html_form_event_handler() that found the input from the resource into a new method "DilloHtmlInput *DilloHtmlForm::getInput (void *v_resource)". Regards, Jeremy Henty