Add role PluginRemover

[`PluginRemover`](https://metacpan.org/pod/Dist::Zilla::Role::PluginBundle::PluginRemover) is a role that makes easy to disable some plugins from the set provided by Milla. Much cleaner than using [[`@Filter`](https://metacpan.org/pod/Dist::Zilla::PluginBundle::Filter)].