Adds musicpref to console and sound options menu, which allows users to select whether to prioritize MIDI or Digital music.
Functions GameMIDIMusic_OnChange and GameDigiMusic_OnChange updated to not assume digital music priority, and to have more consistent behavior between the two.
Positive side effect of using P_RestoreMusic in these functions means that powerup music (speed shoes, invincibility) will restore in the correct position when reenabling the original MusicType they loaded in with.
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...
* S_Init -> S_InitSfxChannels because it did mostly SFX anyway
* S_MusicPlaying, S_MusicPaused, S_MusicName, S_MusicExists new status methods
* I_MusicPlaying, I_MusicPaused
(cherry picked from commit f5f0b5e76c)
* In s_sound, they are merged to one method as well, but there are still two separate digvolume and seqvolume variables
* Simplified Dig/MidiMusicDisabled in s_sound
* Method reordering
(cherry picked from commit 701cc5a7dd)
