Connect to central presenter

[paulsonnentag]

• [x] players can connect to the presenter by entering their name
• [x] client connects to presenter with name and generated connection token

[H3rby7]

https://github.com/hdm-project/server/wiki
connection without name so far (but we have cuteness)

[H3rby7]

Added name upon connection When presenter connection fails, name is automatically retransmitted upon reconnect