Reasoning:
* They're horribly broken (they completely ignore slopes).
* A similar final demo GL-only feature (coronas) has been completely disabled.
* Nobody's going to bugfix them before release because not even the devteam's resident GL users use them.
* They look ugly.
https://cdn.discordapp.com/attachments/405336003239477249/641295998395613224/srb20042.gif
* Port MUSICDEFs from Kart.
* Safe to modify without modifying game, so we can put it in music.dta eventually.
* "Title", "AltTitle", "Authors" fields are self-evident.
* "Soundtestpage" and "Soundtestcond" are used to determine which sound test unlockable can play them (set with Unlockable's variable, just like Level Select).
* "Stoppingtime" and "BPM" both accept floats, and are used for presentation stuff on the sound test.
* Ironically, we don't share a single field name with them. Such is the case of differing foci, though, and I expect they'll change their implementation to match (since this is necessary for a sound test).
* Change how S_AddSoundFx works to avoid iterating through all of them, and to allow cv_soundtest to only scroll through defined slots (instead of the infinite wall of thok sounds when scrolling to the left).
* Change V_DrawFixedPatch to allow scaling on two seperate axes.
* Now called "V_DrawStretchyFixedPatch".
* "V_DrawFixedPatch" is a macro to V_DrawStretchyFixedPatch now (same scale on both axes).
* Available to Lua under v.drawStretched!
* Even works in GL!
* Bugfix: Add SR_PLAYER to SOC's menutypes_list.
Stay tuned for the merge request, where I put the onus on the Music Team to finish this off...
* Store the number of frames per sprite2 run in the spr2frames struct.
* Reintroduce P_GetModelSprite2, to allow for the sprite2 defaulting system to be used to full advantage even in GL.
* Instead of splitting the SUPER and normal SPR2 stuff within the same cell of the struct, have them exist in different cells just like in the "normal" sprite2 structs.
* Allow for just providing spr2 frames in order without specifying which "normal" sprite2 frame it's supposed to replace.
Also:
* Fix FF_VERTICALFLIP-ignoring regression.
* Fix whitespace adjustment in win_dll.c
* Remove bracket in P_GetSkinSprite2 because I realised it was extraneous while making sure P_GetModelSprite2 worked with it.
