UFO:Alien Invasion Code

* Re-encoded Marine's tracks with various fixes as well (various problems found)
* I found numerous mastering errors and mistakes with the original encoded tracks - some parts were heavily "brickwalled" (Un-Officially called "Loudness War Effect" in audio engineering) resulting in ugly clipping in some places so I was forced to re-normalize cutting back as low as minus 1.5 dB (which is a lot for something like this) in some places.
* Other issues and inconsistent encoding mistakes were found.
* I did my best to fix these and other problems but since I don't have the source track files I couldn't fix everything.
* No offense, but if Marine is still around in the forum it would be nice if he could re-do the final stages of rendering some of these, especially with the output gain not shoved so hot that it throws whatever mastering plug-in he used. The music is nice, but the final mixdown was... messy.

* forgot this file in my previous commit (music reconverted)

* new music tracks by Marine - license is still unknown, but he will hopefully release it under the terms of a compatible license - see http://ufoai.ninex.info/forum/index.php?topic=4168.0 (if not, we have to remove them again)