Adds a new custom heist tracks with a few songs from SMT IV.

Stealth: https://www.youtube.com/watch?v=DjQspoLdhI4

Control: https://www.youtube.com/watch?v=qeIhLn3-NDk

Anticipation: https://www.youtube.com/watch?v=KHhpFGmmUMU

Assault: https://www.youtube.com/watch?v=EcZHm4VllDs