GeekMail-Pro | Advanced mailbox system (1.12x-1.19x)

1. Fix the problem of mail display. Now the icon information will be updated correctly when receiving mail 2. Fix the problem of sending and receiving offline mail. 3. Strengthen the external mailbox binding logic. Now players need to confirm the binding through the mailbox verification code. 4. Fix the main thread problem of the global mail card. 5. Improve chat capture interactive text. 6. Added papi variable character% gkm_ Main% will display the external mailbox bound by the player 7. Add that the current mailbox main interface will support parsing papi variables This update of V3 has entered a stable stage.