Sound improvements

[Xottab-DUTY]

• [x] Check if sound zones enabled. If disabled, enable optionally. (they were enabled, but I don't remember the commit)
• [x] #83
• [x] Add EFX support (d215214ca2c54a17beb167e4f89272f171fd4df2)
• [x] #45
• [x] Completely replace EAX with EFX. Refused in favor of SteamAudio.
• [ ] #70
• [ ] #142

[Xottab-DUTY]

Useful links: https://github.com/FrictionalGames/OALWrapper – OpenAL wrapper with EFX support

https://github.com/id-Software/DOOM-3/tree/master/neo/openal/include – EAX 2.0 to EAX 5.0 headers https://github.com/id-Software/DOOM-3/tree/master/neo/sound https://github.com/dhewm/dhewm3/tree/master/neo/sound – OpenAL wrapper with EFX support https://github.com/dhewm/dhewm3/commit/ece2adbdcd3e485bc45efa0fba04f8c4907e65d1 – EAX to EFX port implementation

https://github.com/openalext/openalext/wiki

https://github.com/kcat/openal-soft/tree/master/examples

[Xottab-DUTY]

Useful commits: https://github.com/ShokerStlk/xray-16-SWM/commits/swm_dev/src/xrSound https://github.com/OGSR/OGSR-Engine/commit/265197f9641b55ce74a296b60cf894982f22be2a

[mirh]

Unless you are trying to *add* new effects to the game, I'm missing your aim.

Whether it's EAX or EFX, the end-user result should be the same. And since the only two implementations with a full support of either of them, also support the other now.. there's not really a point into switching them (besides just wanting to tinker with them for its own educational sake).

[Xottab-DUTY]

My main aim is, of course, EFX. Current implementation uses somewhat minimal set of features (I can be wrong) and, moreover, it's buggy on Linux.

Because of that, EAX is preferred on Windows and on Linux, where EAX is unavailable, EFX is disabled by default. (but can be enabled in the game options as usual)