Weapon costs has been removed. All weapons are now free

SWAT and Enemy tooltip portraits have been realigned

Removed a reference to an old xml file

Compression enhancements to increase performance and reduce overall filesize.

1. Implements atlas files which compress multiple images into a single png file.
2. Sounds now compressed into ogg vorbis format
3. Pistol and shotgun backups removed as seem to be causing waypoint errors.