Solfeador - Music reading

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v2.1.1:
- Bugfix: the statistics of notes per minute were wrong

v2.1.0:
- Added option to show or hide the clef

v2.0.0:
- Sound added
- Clefs during game shown

v1.2.0:
- Google Play Games integration for achievements

v1.1.0:
- New levels
- Better support in low density screens