New Helpers function: parse_wp_query_arguments

[ajaydsouza]

Add new function in Helpers. Also parse CRP_Query to allow for all WP_Query parameters

	/**
	 * Parse WP_Query variables to parse comma separated list of IDs and convert them to arrays as needed by WP_Query.
	 *
	 * @param array $query_vars Defined query variables.
	 * @return array Complete query variables with undefined ones filled in empty.
	 */
	public static function parse_wp_query_arguments( $query_vars ) {

		$array_keys = array(
			'category__in',
			'category__not_in',
			'category__and',
			'post__in',
			'post__not_in',
			'post_name__in',
			'tag__in',
			'tag__not_in',
			'tag__and',
			'tag_slug__in',
			'tag_slug__and',
			'post_parent__in',
			'post_parent__not_in',
			'author__in',
			'author__not_in',
		);

		foreach ( $array_keys as $key ) {
			if ( isset( $query_vars[ $key ] ) ) {
				$query_vars[ $key ] = wp_parse_list( $query_vars[ $key ] );
			}
		}

		return $query_vars;
	}