[CGMZ] Musical Battles - Version Alpha R2

Hi all, today this plugin was updated to version AlphaR2!

This version adds success chance to your BGM change effects, and a separate string that can display if the music change is not successful. It also added a new string option for when the music that was attempted to change to is already playing. Both of these new display text options are optional, if you do not set them up no text will display in those conditions.

• Added success chance to BGM change effect
• Added display text for when the music is already playing