Hotfix 1.2.1 (left-handed option)

[list] [*] Added the left-handed option in the Options menu. [i]note: In the tutorial the left-handed option is not available in the explanation, but it is available for the playable test. note: The left-handed option is not yet available in casual mode.[/i] [*] Added the option to choose the skin color of the hands (3 skin tones) in the Options menu. [*] Fixed a bug that prevented obtaining the "Focus" Baton. [*] A bug that prevented getting 100% accuracy in some musical pieces has been fixed. [*] Performance optimizations. [/list]