feat: remove datastores and implement Managers (#3696)

* Initial commit: add 5 initial managers

- Base manager
- GuildChannelManager
- MessageManager
- PresenceManager
- Reaction Manager
- Added LimitedCollection

* Add GuildEmojiManager, various fixes

* Modify some managers and add guildmembermanager

* Initial integration

* Delete old stores

* Integration part two, removed LRUCollection

- Most of the integration has been finished
- TODO typings
- Removed LRUCollection, needless sweeping

* Typings + stuff i somehow missed in ChannelManager

* LimitedCollection typings/ final changes

* Various jsdoc and syntactical fixes, Removed Util.mixin()

* tslint fix

* Grammatical and logical changes

* Delete temporary file placed by mistake

* Grammatical changes

* Add missing type

* Update jsdoc examples

* fix: ChannelManager#remove should call cache#delete not cache#remove

* fix recursive require

* Fix missed cache in util

* fix: more missed cache

* Remove accidental _fetchMany change from #3645

* fix: use .cache.delete() over .remove()

* fix: missing cache in ReactionCollector

* fix: missed cache in client

* fix: members is a collection not a manager

Co-Authored-By: Sugden <28943913+NotSugden@users.noreply.github.com>

* fix: various docs and cache fixes

* fix: missed cache

* fix: missing _roles

* Final testing and debugging

* LimitedCollection: return the Collection instead of undefined on .set

* Add cache to BaseManager in typings

* Commit fixes i forgot to stage yesterday

* Update invite events

* Account for new commit

* fix: MessageReactionRemoveAll should call .cache.clear()

* fix: add .cache at various places, correct return type

* docs: remove mentions of 'store'

* Add extra documented properties to typings

Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>
Co-authored-by: SpaceEEC <spaceeec@yahoo.com>

src/client/actions/PresenceUpdate.js

@@ -5,7 +5,7 @@ const { Events } = require('../../util/Constants');
 
 class PresenceUpdateAction extends Action {
   handle(data) {
-    let user = this.client.users.get(data.user.id);
+    let user = this.client.users.cache.get(data.user.id);
     if (!user && data.user.username) user = this.client.users.add(data.user);
     if (!user) return;
 
@@ -13,12 +13,12 @@ class PresenceUpdateAction extends Action {
       if (!user.equals(data.user)) this.client.actions.UserUpdate.handle(data.user);
     }
 
-    const guild = this.client.guilds.get(data.guild_id);
+    const guild = this.client.guilds.cache.get(data.guild_id);
     if (!guild) return;
 
-    let oldPresence = guild.presences.get(user.id);
+    let oldPresence = guild.presences.cache.get(user.id);
     if (oldPresence) oldPresence = oldPresence._clone();
-    let member = guild.members.get(user.id);
+    let member = guild.members.cache.get(user.id);
     if (!member && data.status !== 'offline') {
       member = guild.members.add({
         user,