[CGMZ] Mailbox - Version Alpha R8

Hi all, today this plugin was updated to version AlphaR8!

This version adds a Single Letter scene, where you can show an individual letter without the letter select or delete windows to worry about. This might come in handy if you have an especially important letter you want to be sure the player reads.

See below gif for how this can look:

This update also includes a lot of minor quality of life updates. The display window now supports automatic space after label text, and the integration parameters were organized. Delete window padding now considers custom padding from [CGMZ] Window Settings. The integration with [CGMZ] Toast Manager now supports all toast types instead of just text.

• Added single letter scene
• Added support for automatic space after label parameters
• [CGMZ] Toast Manager integration now supports all toast types
• Delete window padding now accounts for [CGMZ] Window Settings integration
• Organized integration parameters