v0.8.1 update

v0.8.1:

-Fixed a bug that the song"2000BPM MELODIC EXTRATONE"has two same charts for Hard and Hard-EX.

v0.8:

-Added Main Story Chapter 5(3 Songs)

-Added Hard-EX charts to all of the Freeplay Songs

-Added a Hard-EX chart to the song"Abandonment"

-Added Challenge mode(Play main chapters in STORY MODE to unlock Hard-EX charts!)

-Removed 3 songs

-Removed Dan Course Mode