Bugzilla ❤️ Mojolicious

In this pull request it is possible to:

• Call Bugzilla’s authentication function from Mojolicious controllers
• Render Bugzilla’s templates (which are template toolkit) from Mojo’s render
  (no small thing as we do some odd things to TT2)
• Parts of bugzilla that need to examine the HTTP request can (mostly) do so now

This patch does a lot of plumbing, but the result of this work is that
you could replace index.cgi with something like the following:

get '/' => sub {
    my $c = shift;
    my $user = Bugzilla->login(LOGIN_OPTIONAL);
    $c->stash->{use_login_page} = 1;
    $c->render( template => 'index.html.tmpl', handler => 'bugzilla', user => $user );
};