[CGMZ] Mailbox - Version Alpha R2

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

This update adds toast manager integration for receiving letters and collecting attachments. Now you can show a toast window when the player receives a letter, and you can also show one for each item collected from an attachment to a letter when the mail is opened.

This update also adds a sound effect parameter to play when a piece of mail is opened. There is a default sound effect parameter which will play if a letter does not have a sound effect, or you can also assign different sound effects for each letter.

• Added sound effects for opening letters
• Added Toast Manager integration for receive letter and collect attachment