cross-server messaging

# Messaging System
The way that lobby and game servers communicate with each other.
In local mode, messages are sent and received instantly.

**Tasks**
- [x] Add local messaging
- [x] Add MySQL messaging
- [x] Add Redis messaging
- [ ] Integrate creating maps with the messaging system.
- [ ] Integrate editing maps with the messaging system.
- [ ] Integrate hosting maps with the messaging system.