Query plugin intents from setup wizard

[mStirner]

Query plugin intents as checklist from wizard, and create a "metadata.json"/"installation.json". Could also be used to update the README.md when #8 is implemented.

[mStirner]

{
    type: "checkbox",
    name: "plugin_intents",
    choices: [
        "devices", "endpoints", "mdns", "mqtt",
        "plugins", "rooms", "scenes", "ssdp",
        "store", "users", "vault", "webhooks"
    ]
}, 

{
  delete_examples_folder: false,
  set_pkg_name: false,
  generate_uuid: false,
  plugin_intents: [ 'devices', 'endpoints', 'mdns', 'mqtt' ],
  remove_setup_wizard: false
}