Create models for all Discord objects

[Bluenix2]

Summary

All objects recieved from Discord needs to be wrapped with a class that takes the dictionary from the JSON data and sets attributes. There's a lot of them, so this is tracking that.

Tasks

These are in no particular order:

• [x] Guilds
• [ ] Guild templates
• [x] Members
• [x] Roles
  • [x] Roles
  • [x] Permissions
  • [x] Permission overwrites
• [x] Emojis
• [x] Stickers
• [x] Reactions
• [x] Channels
  • [x] Text channels
  • [x] Voice channels
  • [x] Category channels
  • [x] News channels
  • [x] Thread channels
  • [ ] Forums
• [x] Invites
• [x] Application
• [x] Intergrations
• [x] Users
• [x] Messages
  • [x] Attachments
  • [x] Embeds
• [ ] Webhooks
• [ ] Audit log objects
• [ ] Voice state
• [ ] Auto moderation
  • [ ] Automod rules
  • [ ] Automod executions

[Bluenix2]

I have decided to do this completely stateless - designing a state API with caching at the same time and figuring out how to pass the RESTClient is premature optimization that's slowing down the progression of this issue.