v5

[mafintosh]

Will form the basis for Hyperswarm v5

• [x] make it work
• [x] migrate tests from v4
• [x] migrate examples from v4
• [x] docs

[davidmarkclements]

if we're willing to drop Node 12 and below for v5 all private methods could be implemented as true private methods e.g.:

class HyperDHT extends DHT {
  constructor (opts = {}) {
    super({ bootstrap: BOOTSTRAP_NODES, ...opts })
    this.on('persistent', this.#ondhtpersistent)
  }
  #ondhtpersistent () {
    this.persistent = new PersistentNode(this)
  }
}

also we could use instance prop shorthand for both public and private:

class HyperDHT extends DHT {
  persistent = null
  #somethingPrivate = true
  constructor (opts = {}) {
    super({ bootstrap: BOOTSTRAP_NODES, ...opts })
    this.on('persistent', this.#ondhtpersistent)
  }
  #ondhtpersistent () {
    this.persistent = new PersistentNode(this)
  }
}

(node 12 is EOL in 10 months)

[mafintosh]

@davidmarkclements super down to look at the private props/methods later - merging for now as it should all work now for the RC