Simple Mail

1.8 Reupload - Fixed items not returning to inventory when canceling sending mail

Commands Changed:
/mail - Opens your inbox (unchanged)
/sendmail - Now opens a player selection GUI instead of requiring player name
Removed: /sendmail [player], /sendmail_server, /sendmail_all commands

New Features:
Player Selection GUI - Click player heads to select recipients
OP Special Buttons:
"All Online Players" - Send to everyone currently online
"All Players" - Send to all players (online + offline)
"Change Sender Name" - Customize sender name with color code support (use & for colors)
Mail Expiration - Automatic cleanup of old mail after configurable days
Expiration Display - Shows days remaining on mail packages
Pagination - Next/Previous buttons for player selection and inbox (45 items per page)
Close Button - Added to player selection menu for easy navigation
Claim All Button - Quickly claim all items from a mail package
Auto-Return to Inbox - Automatically returns to inbox after claiming mail

Improvements:
Items are now read-only in mail packages (can take but not place back)
Items automatically added to inventory when closing mail (drops if inventory full)
Returns to player selection after sending mail for easier multi-send
Better visual feedback with color-coded buttons
Improved mail package display with sender and timestamp info

Config Options:
mailExpirationDays - Days before mail expires (0 = never, default: 30)
maxPackagesPerPage - Max mail packages per inbox page (default: 45)
allowNonOpSendmail - Allow non-OP players to send mail
allowNonOpMailCommand - Allow non-OP players to use /mail command
notifyOnLogin - Notify players of mail on login
mailNotificationSound - Custom sound for mail notifications