* 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
* Re-purpose I_LoadSong for digital music loading
* I_StartDigSong logic split between I_LoadSong and I_PlaySong
* Pause, Stop, and Unload routines are combined from Digi and MIDI
* music_lumpnum, music_data, music_handle from s_sound.c are gone