Implement reading lyrics from XML
Implement lyrics on screen

* There is currently a bug at the end of the song that results in a crash
Fix memory leak bug from last commit
Add more songs

* In My Room
* Tetris
* Ripe and Ruin
* Rename tune to Twinkle
Add starting note calibration

* Sing the note you want to start on while holding the screen
Add random song picker

TODO: Make song picker not random