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/structures/Webhook.js

@@ -1,5 +1,6 @@
 const path = require('path');
 const Util = require('../util/Util');
+const DataResolver = require('../util/DataResolver');
 const Embed = require('./MessageEmbed');
 const MessageAttachment = require('./MessageAttachment');
 const MessageEmbed = require('./MessageEmbed');
@@ -168,7 +169,7 @@ class Webhook {
       }
 
       return Promise.all(options.files.map(file =>
-        this.client.resolver.resolveFile(file.attachment).then(resource => {
+        DataResolver.resolveFile(file.attachment, this.client.browser).then(resource => {
           file.file = resource;
           return file;
         })
@@ -248,7 +249,7 @@ class Webhook {
    */
   edit({ name = this.name, avatar }, reason) {
     if (avatar && (typeof avatar === 'string' && !avatar.startsWith('data:'))) {
-      return this.client.resolver.resolveImage(avatar).then(image =>
+      return DataResolver.resolveImage(avatar, this.client.browser).then(image =>
         this.edit({ name, avatar: image }, reason)
       );
     }