New song, tweaks (and less copyrighted screaming!)

Changes:

• The title theme has been updated to remove the Mortal Kombat scream, replacing it are some busted pipes!
• The song Boomer Be Gone has been readded, now that it has been remastered to be less quiet
• Boomer shots now glow the player colour who fired it, now you can know who killed you more easily in the mayhem!
• The AI has been made a bit slower, but they're still deadly accurate, next version will have reduced accuracy that improves over the course of an encounter, so watch for that!