New music tracks

New music tracks added.
New version of SoundManager

New functionality added.
Tracks now fade out 5 seconds before their end.
Tracks now fade in 5 seconds from their start.
When a track fades out, the other starts.
Init function now sets only the parameters.
Two new functions.
loadSounds loads the sound effects
setMusic sets the playlist
Comments Added (not in all sections)
New options added

Disable Music (Only for developing purposes)
Mute