This reverts commit 720a1212.

This reverts commit eafed06a.

This reverts commit 7b118550.

* Stop-gap for now. Ideally the logic would be in the respective places.

# Conflicts:
#	src/sdl/mixer_sound.c

# Conflicts:
#	src/sdl/mixer_sound.c

Merge branch 'music-cleanup' of https://git.magicalgirl.moe/STJr/SRB2Internal.git into music-cleanup

* I_GetMusicType() -> I_MusicType()
* Wrap MIDI volume hack in #ifdef _WIN32

* S_MusicInfo method to retrieve name, flags, and looping

* 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

* 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

* Revised S_PlayMusic arguments
* Now music plays again!