The account tracker had one doc comment above the constructor that
partially served to document the constructor, but mostly contained a
type definition for the class itself. It has been split into two
blocks; one for the class, one for the constructor. The constructor doc
comment has also been expanded to document all constructor options.
The `chainId` is now used by the account tracker to identify the
current network, instead of the `networkId`. This should have no
functional impact, aside from that different chains with the same
`networkId` will now be correctly distinguished from each other.
An optimization in `account-tracker.js` was being skipped consistently
due to a type error (a number was being compared to a string).
The optimization in this case was to update the balances for all
accounts with a single request, rather than one request per account.
* Specify type before parameter name
Various JSDoc `@param` entries were specified as `name {type}` rather
than `{type} name`.
A couple of `@return` entries have been given types as well.
* Use JSDoc optional syntax rather than Closure syntax
* Use @returns rather than @return
* Use consistent built-in type capitalization
Primitive types are lower-case, and Object is upper-case.
* Separate param/return description with a dash
EthStore was only being used for tracking account balances and nonces now, so I removed its block-tracking duties, renamed it account-tracker, and removed it as a dependency from `KeyringController`, so that KRC can go live on without a hard dep on it.
