add music switch

[ookcode]

Hello poboke. The Plugin is amazing and i loved it so much. But the background music is too...... something soul pollute:-D So i add a music swich,hope you like it!

[poboke]

Thank you very much. But adding some config menus is on my todo list. I have added the music config menu. Thanks again.

[ookcode]

Oh...That's great. I see the change,hope you keep doing it. ps: I love miku so mush.(≧▽≦)/