[CGMZ] Core - Version 1.31.0

Hi all, today this plugin was updated to version 1.31.0!

This version adds gamepad connect and disconnect listeners, which will help some plugins detect the gamepad status and when it changes.

This version also keeps track of the background type set for a window, in case it is needed later. It keeps track of the previous map id the player was on as well, since some plugins can benefit from knowing the previous map id.

• Added gamepad listeners
• Added window background type tracking
• Added previous map id tracking