AHiT Birds Rift stealth track for Payday 2

Adds custom stealth-only music pack: Battle of the Birds Time Rift from A Hat in Time. Point of No Return is a Collapsing Rift track. Also seen (uh, heard) in the video is detection sound for AHiT as well. Link: https://modworkshop.net/mod/41840 Detection sound mod: https://modworkshop.net/mod/41810