'Promised' settings

[benel]

Hypertopic settings are got:

• from a database (in LaSuli),
• from a file (in Porphyry).

If the Hypertopic constructor could accept promises, development would be easier.

[benel]

Examples of use:

From local storage

const DB = new Hypertopic(browser.storage.local.get('services'));

instead of

const DB = browser.storage.local.get('services')
  .then(x => x.services)
  .then(x => new Hypertopic(x));

From a file

const DB = new Hypertopic(fetchYAML('./config.yml'));

instead of

const DB = fetch('./config.yml')
  .then(x => x.text())
  .then(x => yaml.parse(x))
  .then(x => x.services)
  .then(x => new Hypertopic(x));

[benel]

Or maybe, integration of the services step would be enough:

const DB = browser.storage.local.get('services')
  .then(x => new Hypertopic(x));

const DB = (fetchYAML('./config.yml')
  .then(x => new Hypertopic(x));