[CGMZ] Battle BGM Control - Version Alpha R4

Hi all, today this plugin was updated to version AlphaR4!
This version adds some conditions to your battle BGM themes. You can now set a switch id that must be ON before the theme can be heard, so you can have more control over when themes are played.
Even though the theme select is random, your player could get unlucky and hear the same theme multiple times in a row. There is now an option to track the last heard theme and prevent that theme from being played twice in a row. Note that this is not saved so will only work for battles within the same play session.
- Added switch condition to themes
- Added option to prevent repeating same theme twice in a row