Restriction of rooms by groups

[JCtapuk]

I'll forgive you for adding a ban on creating or entering a room if the player has exceeded the limit on the group that the player is currently active in.

For example the room "battle" has a group "battles" then the player cannot join another room "finalBattle" which has the name of the group "battles"

And groups can be configured in the number of rooms option

  serverOptions: {
    groups: {
      battles: 1 // limit active instance rooms
    }
  }

server.define('battle', Battle).setGroup('battles')
server.define('finalBattle', Battle).setGroup('battles')

This will limit the player in the session state how many rooms he can open in the client