efa: Use utf8, switch to Perl license

#!/usr/bin/env perl

## Copyright © 2009-2015 by Daniel Friesel <derf@finalrewind.org>

## License: WTFPL <http://sam.zoy.org/wtfpl>

##   0. You just DO WHAT THE FUCK YOU WANT TO.

use strict;

use warnings;

use 5.010;

use utf8;

no if $] >= 5.018, warnings => 'experimental::smartmatch';

=head1 AUTHOR

Copyright (C) 2009-2018 by Daniel Friesel E<lt>derf@finalrewind.orgE<gt>

Copyright (C) 2009-2020 by Daniel Friesel E<lt>derf@finalrewind.orgE<gt>

=head1 LICENSE

  0. You just DO WHAT THE FUCK YOU WANT TO.

This program is licensed under the same terms as Perl itself.