Changes

• Check for friends.css changes when friends window is reopened with autoscanner - a35ab97
  This should fix cases where the auto scanner would miss updates that happened when the client was running. Valve hasn't pushed an update out in a while, though, so I haven't been able to confirm.
• Show running instance if a second instance is launched - 17a769e
• Added settings to configure when tray icon is shown - 2d47566
• Crash fixes and code cleanup