1.0 Release

The original, finished version of the homework.
Java 17 is needed for the Jar file to work.

Features:

• English interface
• load MIDI files and play them
• connect an external MIDI device, like a piano/keyboard, and see what you play there
• play on the computer keyboard (though with a Hungarian layout)
• make notes either fall down or levitate upwards
• make the on-screen piano keyboard smaller or larger, by adding or removing keys from left/right
• save/load the setting previously described, to/from a file
• start and stop playback, best effort feature, as the screen doesn't freeze