Synthesia piano visualizer v5.1 (+ MIDI importer)

Description

go to https://turbowarp.org/710974393?fps=60&turbo faster loading and playing. for it to load properly, DO NOT STOP WHILE IT IS STILL LOADING. after it finishes once, you can stop and restart without it loading again. something I decided to write that's somehow really good at playing MIDI's with many notes. also includes a synthesia-like visualizer for the song. also includes 256 piano sound assets because I hate the default sounds. oh yeah you can load your own songs: just press i then go here https://tomeko.net/online_tools/file_to_hex.php?lang=en and convert you file to a raw hex stream. then paste it and click flag or space once done. Demo song is Necrofantasia from Touhou. kouzeru for pen font. i wrote the rest of the code probably made for @2okrisvadh 's contest idk