Allow *.ydo actions to return PSGI tuple

[hkoba]

To make *.ydo action more PSGI friendly.

After

return sub {
   my ($this, $CON) = @_;
   my $env = $CON->env;
   # ...
   return [403, [], ["Forbidden!"]];
};

Before

return sub {
   my ($this, $CON) = @_;
   $this->YATT->raise_psgi_error(403, "Forbidden");
};