Mostly centered around the HUD, popup, overlay, boss, and player shot
functions we're about to reference in the upcoming decompilations.
Part of P0186, funded by [Anonymous] and Blue Bolt.
Final unknown entity in TH05 that can collide with the player!
Get position independence hype!
(Also, no structure member comments necessary, thanks to the new
types!)
Part of P0111, funded by [Anonymous] and Blue Bolt.