Non-ASCII URIs don't get encoded

[Altreus]

Tried to put an emojum in a URI.

      in method panic at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/2324DD93FE1564E732D8C179A4652788D7AC67A6 (Cro::Uri) line 173
      in regex URI at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/2324DD93FE1564E732D8C179A4652788D7AC67A6 (Cro::Uri) line 27
      in regex TOP at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/2324DD93FE1564E732D8C179A4652788D7AC67A6 (Cro::Uri) line 23
      in method parse at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/2324DD93FE1564E732D8C179A4652788D7AC67A6 (Cro::Uri) line 313
      in method request at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/BD9BD084131C6E7D2BF4FE09570E5EBE604DB8FA (Cro::HTTP::Client) line 327
      in method post at /home/altreus/rakudo/rakudo-star-2018.04/install/share/perl6/site/sources/BD9BD084131C6E7D2BF4FE09570E5EBE604DB8FA (Cro::HTTP::Client) line 298
      in method send at /home/altreus/src/p6-api-discord/lib/API/Discord/HTTP.pm6 (API::Discord::HTTP) line 68
      in method create at /home/altreus/src/p6-api-discord/lib/API/Discord/HTTP.pm6 (API::Discord::HTTP) line 111
      in method add-reaction at /home/altreus/src/p6-api-discord/lib/API/Discord/Message.pm6 (API::Discord::Message) line 127
      in block  at examples/autostar.p6 line 12
      in block  at /home/altreus/src/p6-api-discord/lib/API/Discord.pm6 (API::Discord) line 172
      in method handle-opcode at /home/altreus/src/p6-api-discord/lib/API/Discord/Connection.pm6 (API::Discord::Connection) line 143
      in block  at /home/altreus/src/p6-api-discord/lib/API/Discord/Connection.pm6 (API::Discord::Connection) line 126

Associated code exists in https://github.com/shuppet/p6-api-discord/

[Altai-man]

Thanks for notifying!

It seems we need to use IDNA::Punycode for some URI parts, therefore patch the grammar too. It's a bit complicated, as we want to extract an exact segment part to correctly apply conversion on it, while we have not parsed URI fully yet.