[9730] Mail send related fixes in recent code.

[newsbot]

m src/game/AuctionHouseHandler.cpp

m src/game/AuctionHouseMgr.cpp

m src/game/Mail.cpp

m src/game/Mail.h

m src/game/Player.cpp

m src/shared/revision_nr.h



[9730] Mail send related fixes in recent code.



* Avoid use explicit MailReciever/MailSender where not need.

  Types specially added for autoconvertion from common cases.



* Prevent allow copy text auction mails. It anyway store encoded data.

  Same for some another non-player mails.

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