Add 3 new songs and add new note type (#5351)

Add 3 new songs and add new note type (#5351)

* Added 3 new songs and added new note type to musical_notes.h

Added Megalovania from Undertale, Kataware Doki from Kimi no Na Wa and La Campanella by Lizst to song_list.h
Added the breve (double whole note) and dotted breve note types to musical_notes.h. I included this because the default tempo is quite high, so I thought a note with higher
duration was needed

* Fixed indentation for new notes in musical_notes.h

Changed tabs to spaces in indentation