Update musicplus demo authored by mazmazz's avatar mazmazz
This demo contains the following branches: This demo contains the following branches:
* [music-cleanup](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/12) - Internal cleanup of music code * [music-cleanup](https://git.magicalgirl.moe/STJr/SRB2/merge_requests/278) - Internal cleanup of music code
* [musicplus-core](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/1) - Fading, position, and seeking features * [musicplus-core](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/1) - Fading, position, and seeking features
* [musicplus-lua](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/2) - Lua support for new music features * [musicplus-lua](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/2) - Lua support for new music features
* [musicplus-sdlmixerx](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/3) - Uses [SDL Mixer X](https://github.com/WohlSoft/SDL-Mixer-X) fork to provide non-native MIDI (with configurable instruments!) and fix MP3 glitches * [musicplus-sdlmixerx](https://git.magicalgirl.moe/digiku/SRB2/merge_requests/3) - Uses [SDL Mixer X](https://github.com/WohlSoft/SDL-Mixer-X) fork to provide non-native MIDI (with configurable instruments!) and fix MP3 glitches
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