Waveform editor and note quantization!

UPDATE 2: You can now edit waveforms in the "waveform editor"! Press W to enter the waveform editor, then point and click in the bars to edit their position. Press enter when finished to use your newly-made waveform!

UPDATE 3: the notes are now "quantized" (meaning they are moved until they line up with "semitones", like the notes on a piano), and by default are in A minor (all the white keys on a piano).  Press C to switch to "chromatic" mode (all the keys on a piano, white and black).