Remove MTIgnore tag and HTML comments.

config.yaml

tags:
    modifier:
        remove_ignore: >
            sub {
                my ( $text, $arg ) = @_;
                $text =~ s/<mt:{0,1}ignore>.*?<\/mt:{0,1}ignore>//gsi;
                if ( $arg ne '1' ) {
                    my $comment = quotemeta( '<!--' );
                    my $comment_end = quotemeta( '-->' );
                    $text =~ s/$comment.*?$comment_end//sg;
                    if ( $arg eq '3' ) {
                        $text =~ s/^\s*\n//gm;
                        $text =~ s/\n.*/\n/sg;
                    }
                }
                $text;
            }