Setup sound effects:

- setup_shot.wav
  Source: "Gunshots" on OpenGameArt
  Author: kurt
  File used: first shot from "22 Magnum.wav" (trimmed, mono, 44.1 kHz)
  License: CC0 1.0
  Page: https://opengameart.org/content/gunshots

- setup_boss_death.wav
  Source: "grunts of male death and pain" on OpenGameArt
  Author: thebardofblasphemy
  File used: a short vocal excerpt from "death pain grunts.wav" (trimmed, lowered, mono, 44.1 kHz)
  License: CC0 1.0
  Page: https://opengameart.org/content/grunts-male-death-and-pain
