Among the newly added rules, there are quite a few intended to enforce
compliance of CONTRIBUTING.md-blessed idioms, as well as ensure
safe usage of classes and constant bindings.
We are also now enforcing usage of early return in commands.js,
which has 100% compliance as of fd2c45c.
- Method `this.runBroadcast()` has been split from `this.canBroadcast()`.
It's now the only method handling command-usage and intended as the main API
for synchronous commands. Async commands will execute both separately.
Note that the `suppressMessage` parameter is now passed to `runBroadcast`.
- The semantics of `broadcasting` have been similarly split.
`this,broadcastMessage` will be set to a truthy value when `this.canBroadcast` is run.
`this,broadcasting` will only be set to `true` once `this.runBroadcast` is executed.
