Core/Player: Implement a method to send out the Postmaster's item retrieval mails as it seems to be used in multiple places and also send disenchant roll result as a mail if the player's inventory is full
Merge pull request #12958 from Nyeriah/patch-ir

Core/Player: Implement a method to send out the Postmaster's item retrie...
Core/Battleground/AV: convert trinity_strings to proper creature_text

Closes #12861
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb

Conflicts:
	src/server/game/Battlegrounds/Zones/BattlegroundAV.cpp
	src/server/game/Entities/Player/Player.cpp
	src/server/game/Entities/Player/Player.h
	src/server/game/Groups/Group.cpp
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