Refactor decaffeinate output to more natural/idiomatic javascript

- Remove unnecessary Array.from usages from subscriptions.js

  These were all Arrays before, so Array.from is a no-op

- Remove unnecessary IIFEs from subscriptions.js

- Manually decaffeinate sample ActionCable code in comments

  Here the coffeescript -> ES2015 conversion was done by hand rather than
  using decaffeinate, because these code samples were simple enough.

- Refactor ActionCable.Subscription to avoid initClass

- Refactor ActionCable.Subscription to use ES2015 default parameters

- Refactor ActionCable.ConnectionMonitor to avoid initClass

- Refactor ActionCable.ConnectionMonitor to use shorter variations of null checks

- Remove unnecessary code created because of implicit returns in ConnectionMonitor

  This removes the `return` statements that were returning the value of
  console.log and those from private methods whose return value was not
  being used.

- Refactor ActionCable.Connection to avoid initClass

- Refactor Connection#isProtocolSupported and #isState

  This addresses these three decaffeinate cleanup suggestions:
  - DS101: Remove unnecessary use of Array.from
  - DS104: Avoid inline assignments
  - DS204: Change includes calls to have a more natural evaluation order

  It also removes the use of Array.prototype.includes, which means we
  don't have to worry about providing a polyfill or requiring that end
  users provide one.

- Refactor ActionCable.Connection to use ES2015 default parameters

- Refactor ActionCable.Connection to use shorter variations of null checks

- Remove return statements that return the value of console.log() in ActionCable.Connection

- Simplify complex destructure assignment in connection.js

  decaffeinate had inserted
  ```
  adjustedLength = Math.max(protocols.length, 1)
  ```
  to be safe, but we know that there has to always be at least one
  protocol, so we don't have to worry about protocols.length being 0 here.

- Refactor Connection#getState

  The decaffeinate translation of this method was not very clear, so we've
  rewritten it to be more natural.

- Simplify destructure assignment in connection.js

- Remove unnecessary use of Array.from from action_cable.js.erb

- Refactor ActionCable#createConsumer and #getConfig

  This addresses these two decaffeinate cleanup suggestions:
  - DS104: Avoid inline assignments
  - DS207: Consider shorter variations of null checks

- Remove unnecessary code created because of implicit returns in action_cable.js.erb

  This removes the `return` statements that were returning the value of
  console.log and those from methods that just set and unset the
  `debugging` flag.

- Remove decaffeinate suggestion about avoiding top-level this

  In this case, the top-level `this` is intentional, so it's okay to
  ignore this suggestion.

- Remove decaffeinate suggestions about removing unnecessary returns

  I did remove some of the return statements in previous commits, where
  it seemed appropriate. However, the rest of these should probably remain
  because the return values have been exposed through the public API. If
  we want to break that contract, we can do so, but I think it should be
  done deliberately as part of a breaking-API change (separate from this
  coffeescript -> ES2015 conversion)

- Remove unused `unsupportedProtocol` variable from connection.js

  Leaving this would cause eslint to fail

- Refactor Subscriptions methods to avoid `for` ... `of` syntax

  Babel transpiles `for` ... `of` syntax to use `Symbol.iterator`, which
  would require a polyfill in applications that support older browsers.

  The `for` ... `of` syntax was produced by running `decaffeinate`, but in
  these instances a simpler `map` should be sufficient and avoid any
  `Symbol` issues.

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