For ambient sounds that can be cleanly restarted a new 'transient' flag was added so that these do not get written out.
Tested on SW so far, other games yet to do.
After merging the CD enabling CVAR they had the same default (off) as Blood which is wrong.
This also addresses other music related issues, like not properly cycling through the RR music.
* removed all cases of getting a sound handle and checking it later.
* In particular, refactor the cases where the handle is stored in a static local variable. These are fundamentally unsafe because nothing maintains these local variables.
* finished rewriting the PlaySound function. Let's hope this is what was intended, the entire coding here was not particularly good, mixing high and low level sound handling all on the same level.
* call the update routine each tic and not merely every 4th or 8th one, this kind of granularity was ok in 1997 but not with a modern sound engine.
* removed old sound loading code, which was the last bit to use cacheAllocateBlock which is also gone now.
* cleanup of player sound code. All game side tracking of the sound resources has been removed.
does not compile yet.
* reverb/echo is not yet implemented, so there's two stub functions for now.
* RTS needs to be done differently, because the sound engine cannot play raw buffers without any control data.
Because, why not? The SWCustom I use already contains them.
However, since the original source does not play theme MIDIs - only CDA, there's a switch to disable them.
This was one huge mess where nothing fit together.
Also added an enhancement that the CD Audio boss theme tracks are also played when CD music is generally off, because these have no equivalent in MIDI. This needs to be checked if it's stylistically ok, though.
Sound is only partially functional, video mode completely nonfunctional, but it makes no sense adjusting them to the current backend code when it's due for replacement.
* removed some redundant functionality (e.g. Shift-F5 to change - use the console for that!)
* removed a few more leftover parts of the old music system
* savegames should not do more than resuming the music at the point of saving. (DN3D and RR only so far. Blood to be done.)
* handle music enabling/disabling in the backend, which simply knows better what to do. This was only working in the menu, so changing the CVAR had no effect.
Some part are not done yet, and the file system data is currently ignored - there's no way to properly set this up with the file system code Build came with.
