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/ClientApplication.js

@@ -1,5 +1,6 @@
 const Snowflake = require('../util/Snowflake');
 const Constants = require('../util/Constants');
+const DataResolver = require('../util/DataResolver');
 const Base = require('./Base');
 
 /**
@@ -165,7 +166,7 @@ class ClientApplication extends Base {
    * @returns {Promise}
    */
   createAsset(name, data, type) {
-    return this.client.resolveBase64(data).then(b64 =>
+    return DataResolver.resolveBase64(data).then(b64 =>
       this.client.api.applications(this.id).assets.post({ data: {
         name,
         data: b64,