Adds Halo Reach's "Engaged" track into the ST

*With no calm segment of the song, the stealth of this custom track is a part of the "O.N.I Sword Base" music found here (timestamped video):
https://youtu.be/eM8V8B-_PPg?t=115

Demonstration:
https://youtu.be/vPI-V9xtqqs

(Place into mod_overrides)

*requires BeardLib