PianoFlow: Piano practice and Rhythm game

Added a main menu

Added support for playing MIDI files. I still need to add support for tempo changes in the song, but this will do for now.

I added audio!! I figured out how to use Raylib's audio callbacks in C# to get low-latency audio, because without it there's a very noticeable delay between hitting a key and hearing the sound.

Improved the scoring algorithm somewhat. At this point it only considers when the start of the note is hit, not how long the note is held.

Added a basic accuracy/timing system

Added a metronome and the visuals for the falling notes. Nothing happens when you actually press the keys yet, but that will be the next thing to happen.
I found Hafiz Azman's article 'How To Make a Rhythm Game' super valuable when I was deciding how to implement time management.

Added device selection and the ability to select your instruments range, as well as refactored the code a bunch.

Added an actual piano! This took a while to implement, but I figured it out in the end!
Next up is device selection and calibration so I can stop relying on hardcoded values, then I'll add audio so that my friend will stop bugging me, then get to work on the gameplay :D

I got input working! This took longer than I thought it would because of some issues with managed-midi, the library I'm using (if you hold down a note while loading the program the whole thing breaks). In this example, it's taking input from a MIDI keyboard, but you can also do it from a virtual piano keyboard. I'll also add computer keyboard support at some point for people who just want to try it out.