Update v0.1.8.0

[h2]Changes and fixes[/h2]

• added new special event 5
  
• switched to steam web api for better client authentication
  
• added server disconnect message reasons
  
• added log messages for connection problems
  
• fixed rare issue of the game not starting under linux
  
• removed shortcut on online track A-4
  
• fixed rare race condition during online connect