Auto reconnect

 Added:
 * Second DDNet settings page with some settings
 * Auto reconnect feature
 * In-game commands:
  - reconnect_ban
  - reconnect_ban_timeout
  - reconnect_full
  - reconnect_full_timeout

Changed:
 * Disconnected popup
 * Name for first DDNet settings page

Screenshots:
* https://cdn.mediacru.sh/EUGw-wlpM1sz.png
* https://cdn.mediacru.sh/3fG7urLB8IY5.png
* https://cdn.mediacru.sh/pzfv9SV6WNlx.png