#9 pass maxplayers and password to games

[Edwin Stang]

this has to be done for all launch methods if possible

the game should know about the max player number ideally, so joining via ingame is respecting the coopnet settings

the password is required for ingame joiners aswell. we have to find out how to implement this in a good manner, so users dont get asked twice (once in coopnet and once ingame) for the password