$LoopFiringSnd: doesn't work, and a few other things.

[MoerasGrizzly]

Whilst $startfiringsnd: and $endfiringsnd: work as expected, $loopfiringsnd does not and plays no sounds.

Atm I'm trying to give BP's Gattler a proper minigun spin-up and spin-down sound (As it takes a second to fire, and I want the player to hear something to indicate that this spin up is happening). However, if the player simply clicks the button, the $startfiringsnd keeps playing. Ideally you'd want $endfiringsnd to cut off $startfiringsnd and $loopfiringsnd.

[MoerasGrizzly]

Issue detected in both the latest RC and the FSO 24.0.2 build.

[Goober5000]

@Baezon any thoughts?

[Baezon]

As an object sound apparently, loop sounds must be 3d, and simply won't play otherwise. I shall amend the wiki, and the above PR unifies the 3d nature of the existing fields.

A forthcoming PR will add 2d versions of them, as well as a flag to interrupt the start sound when the trigger releases.