[CGMZ] Mailbox - Version Alpha R6

Hi all, today this plugin was updated to version AlphaR6!

This version adds a plugin command to unsend mail. This will allow you to repeat sending the same letter in your game if you have need to do so, such as a weekly or monthly letter if your game uses a time system or something like that. Unsending a letter also undeletes it and allows the player to collect any attachments again if it gets sent again.

This update also made deleting letters optional. You can now disable the ability of your player to delete letters. Of course, the delete letter plugin command is not affected by this.

This update also added integrations with both [CGMZ] Window Backgrounds and [CGMZ] Window Settings. These allow you to show your own images as a window background including scrolling animated parallax images, and control any window's tone, windowskin, style, etc. respectively.

• Added option to allow or not allow deleting letters
• Added plugin command to unsend mail
• Added integration with [CGMZ] Window Settings
• Added integration with [CGMZ] Window Backgrounds