PostMaster

• greatly reduced file size.

• Fixed voucher/mail claim command placeholder replacement so player targeting is reliable.
• Added robust, case-insensitive replacement for player placeholders in reward commands:
  • %player%
  • %PLAYER% (and any case variation)
  • %player_name%
  • %name%
• Kept %uuid% replacement and made it case-insensitive as well.

• fix an issue that caused claiming vouchers not to work properly

• fixed a permission bug that didn't allow normal players to send items

Fixed a bug that caused claiming an item or a voucher in the Mailbox to generate an exception.