Actually display secret achievements once they have been achieved.
Don't show a password entry field for the currently logged in user.
Added support for detecting BSD versions; added uname based fallback
on linux in case /etc/*release does not find valid info.
Remove data after "-" when using uname (which could theoretically be
used to identify a system).
Fixed windows compilation.
Change "Cancel" to 'Exit game' and make the back arrow invisible if
the login screen is shown before the race start.
Replaces sfx->getStatus with isPlaying() functi n which is faster
(for #1511).
Replaced more getStatus() functions.
Reverted 77bd4140a803088231191925e10e4a58e44e0828 (which caused
crash and other sfx to be played only once).
Started to let all sfx related command be executed from the sfx manager
to avoid race condition and crashes.