Datastore cleanup (#1892)

* Start Store cleanup

* wip store cleanup

* fix iterables initiating datastores

* handle the possibility of a datastore with no holds and no its own 'create' method

* more cleanup (instances that need more than just client/data)

* missed RoleStore extras

* not sure how eslint didn't catch that tab...

* avoid re-getting the channel we already have...

* cleanup resolvers and refactor them into DataStores

* ^

* and remove

* fix some bugs

* fix lint

* fix documentation maybe?

* formatting

* fix presences

* really fix presences this time

* bad fix was bad... let;s see how bad this one is..

* forgot to save a file

* make presence resolving take userresolveables too

* fix tabs in jsdocs

* fix bad fix from last night that caused issues, with better fix...

* oops

src/client/BaseClient.js

@@ -1,6 +1,5 @@
 const EventEmitter = require('events');
 const RESTManager = require('../rest/RESTManager');
-const ClientDataResolver = require('./ClientDataResolver');
 const Util = require('../util/Util');
 const Constants = require('../util/Constants');
 
@@ -25,13 +24,6 @@ class BaseClient extends EventEmitter {
      */
     this.rest = new RESTManager(this, options._tokenType);
 
-    /**
-     * The data resolver of the client
-     * @type {ClientDataResolver}
-     * @private
-     */
-    this.resolver = new ClientDataResolver(this);
-
     /**
      * Timeouts set by {@link WebhookClient#setTimeout} that are still active
      * @type {Set<Timeout>}