New songs for bonus rooms

[korbanpapa]

right now, all we have is just one bonus room song. if more bonus room songs are added there probably should be forest, snow, corrupted, tropical, and cloudy peak. it's your choice on which ones are added, but it would be nice to have different/new ones for bonus rooms.

[korbanpapa]

I went through the classic SuperTux songs, and i found Pingus - Snow, can we re-introduce that into the game as a bonus room song? Because it's actually a pretty nice song, and it would probably be very nice after a revamp.