Changed map type in Client struct to Arc<Mutex<HashMap<String, ClientMapValue>>>.
Implemented functions insert_key, get_value and delete_key to the Client type.
Re-export servers::server::ClientMapValue in servers::plugins::prelude.
- Better Client struct (TCP and WebSocket in one type)
- WebSocket is now not a proxy to tcp
- Use async-std instead a tokio
- Use Arc and Client type now have a Clone derive
- Add global CLIENTS list
- added `/disconnect` commands
- moved logger init function to other file
- updated command description
- the `/help` command has been accelerated
- re-export `async_trait` so that it doesn't have to be added to dependencies in plugins