Build 504
[-] Backtiming dismissed after non-playable items
[-] Ramp countdown screen object not working
[+] Remaining time in playlist control bar updated continously
[*] HIGHLY EXPERIMENTAL BUILD! mAirList is now multi-threaded, which means
that many things (e.g. loading a player) happen in the background and
the GUI does not hang. This should heavily improve usability, but
be prepared for some major crashes in the first few builds