Old code in my functions.php – actual or not?

Hi,
i found code in an a older version of an child themes functions.php.
Although i researched and cleared a lot by my own these snippets are unclear.

Are they still necessary / in charge or can they be removed because they are not valid/deprecated?

add_filter('avf_form_use_wpmail', 'avia_change_php_mail', 10, 3);
function avia_change_php_mail($active, $new_post, $form_params){
return true;
}

add_theme_support('avia_template_builder_custom_css');

//entfernt den Kommentarblock und die Datumsangaben aus dem Combo Widget  // 

class avia_combo_widget extends WP_Widget {

		function avia_combo_widget() {
			//Constructor
			$widget_ops = array('classname' => 'avia_combo_widget', 'description' => 'A widget that displays your popular posts, recent posts, recent comments and a tagcloud' );
			$this->WP_Widget( 'avia_combo_widget', THEMENAME.' Combo Widget', $widget_ops );
		}

		function widget($args, $instance)
		{
			// prints the widget

			extract($args, EXTR_SKIP);
			$posts = empty($instance['count']) ? 4 : $instance['count'];

			echo $before_widget;
			echo "<div class='tabcontainer border_tabs top_tab tab_initial_open tab_initial_open__1'>";

			echo '<div class="tab first_tab active_tab widget_tab_popular"><span>'.__('Popular', 'avia_framework').'</span></div>';
			echo "<div class='tab_content active_tab_content'>";
			avia_get_post_list('cat=&orderby=comment_count&posts_per_page='.$posts);
			echo "</div>";

			echo '<div class="tab widget_tab_recent"><span>'.__('Recent', 'avia_framework').'</span></div>';
			echo "<div class='tab_content'>";
			avia_get_post_list('showposts='. $posts .'&orderby=post_date&order=desc');
			echo "</div>";

			echo '<div class="tab last_tab widget_tab_tags"><span>'.__('Tags', 'avia_framework').'</span></div>';
			echo "<div class='tab_content tagcloud'>";
			wp_tag_cloud('smallest=12&largest=12&unit=px');
			echo "</div>";

			echo "</div>";
			echo $after_widget;
		}

		function update($new_instance, $old_instance)
		{
			$instance = $old_instance;
			foreach($new_instance as $key=>$value)
			{
				$instance[$key]	= strip_tags($new_instance[$key]);
			}

			return $instance;
		}

		function form($instance) {
			//widgetform in backend

			$instance = wp_parse_args( (array) $instance, array('count' => 4) );
			if(!is_numeric($instance['count'])) $instance['count'] = 4;

	?>
			<p>
			<label for="<?php echo $this->get_field_id('count'); ?>">Number of posts you want to display:
			<input class="widefat" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>" type="text" value="<?php echo esc_attr($instance['count']); ?>" /></label></p>

		<?php
		}
	}
	
	
	function avia_get_post_list( $avia_new_query , $excerpt = false)
	{
		global $avia_config;
		$image_size = isset($avia_config['widget_image_size']) ? $avia_config['widget_image_size'] : 'widget';
		$additional_loop = new WP_Query($avia_new_query);

		if($additional_loop->have_posts()) :
		echo '<ul class="news-wrap">';
		while ($additional_loop->have_posts()) : $additional_loop->the_post();

		$format = "";
		if(get_post_type() != 'post') 		$format = get_post_type();
		if(empty($format)) 					$format = get_post_format();
     	if(empty($format)) 					$format = 'standard';

		echo '<li class="news-content post-format-'.$format.'">';

		//check for preview images:
		$image = "";

		if(!current_theme_supports('force-post-thumbnails-in-widget'))
			{
			$slides = avia_post_meta(get_the_ID(), 'slideshow');

			if( $slides != "" && !empty( $slides[0]['slideshow_image'] ) )
			{
				$image = avia_image_by_id($slides[0]['slideshow_image'], 'widget', 'image');
			}
		}

		if(!$image && current_theme_supports( 'post-thumbnails' ))
		{
			$image = get_the_post_thumbnail( get_the_ID(), $image_size );
		}

		$time_format = apply_filters( 'avia_widget_time', get_option('date_format')." - ".get_option('time_format'), 'avia_get_post_list' );

		$nothumb = (!$image) ? 'no-news-thumb' : '';

		echo "<a class='news-link' title='".get_the_title()."' href='".get_permalink()."'>";
		echo "<span class='news-thumb $nothumb'>";
		echo $image;
		echo "</span>";
		echo "<strong class='news-headline'>".avia_backend_truncate(get_the_title(), 55," ");
		//echo "<span class='news-time'>".get_the_time($time_format)."</span>";
		echo "</strong>";
		echo "</a>";

		if('display title and excerpt' == $excerpt)
		{
			echo "<div class='news-excerpt'>";
			the_excerpt();
			echo "</div>";
		}

		echo '</li>';

		endwhile;
		echo "</ul>";
		wp_reset_postdata();
		endif;
	}

add_filter('avf_debugging_info', 'remove_debugging_info', $info);

function remove_debugging_info($info) {
$info = '';
return $info;
}

kind regards
eva