* Requested by users, really don't know why...
* Interpolation values are guarded by the CVAR.
* For Blood, integer truncation is employed just like original game.
* For all games where more precise sine/cosine math has been utilised, no changes have been made.
* Initial implementation from d32dcd5f8e was not working properly and already had some workarounds for when the player was underwater, etc.
* Re-read implementation in GDX and rebased off of it.
* Fixes#303.
Parts of the sound system treat entry 0 as "no sound" so nothing placed there would play.
This made the one custom sound in "The Way of Ira" not play because as the last sound being defined it ended up in the first, invalid slot.
0 means 'default', -1 means 'silent'. This caused playback issues for useSoundGen. All other places were passing proper volume values along, this is the only one to read the volume from map data.
Blood needs this for its PlayerSound controller, which is run right on map load - so without this it wouldn't start the sound when a map is initiated from the console.
Aside from not having been functional, this is ultimately more harmful than useful as it forces loading of a large number of textures at the same time during gameplay instead of spreading them out.
* made it palette aware
* use backend facilities to track precached data.
* fixes bug in animation precaching loops - they only precached the base index over and over again.
* Added in fca846272e to deal with signed adjustments but its just not needed.
* Made better use of `binangle`/`fixedhoriz` class getters and setters than before as well.
This was incomplete and just ignored Duke's special music, and the levelnum generation used an outdated formula so that it never managed to assign any music to the maps.
This works as long as the loaded mods have one single .ini file in them - in that case it is assumed that it is supposed to replace blood.ini, which will allow dragging & dropping such archives without further user intervention.
* moving polymost_voxdraw into polymost.cpp.
* consolidated all remaining voxel code in hw_voxels.cpp. All original Build voxel code is completely gone now, except for polymost_voxdraw, so this got moved out of the build/ folder.
* integrate Blood's voxel init code into the main function.
* some further cleanup was allowed as a result of this, so engineInit is gone now because these parts can now be done outside the games' app_init functions.
Fix undefined behavior/potential OOB access in ST_21_FLOOR_DOOR. g_AnimateGoal does not take a sector number, it takes an animation index, and caps at 1024, not 4096.
* Using the Doom-style dome here because it looks better.
* this necessitated changes to the backend to allow both types of sky domes at the same time
* do not clamp panning fields for cloudy sky with the new renderer because this makes the texture jump.
