Quest 4901 "Guardians of the Altar"
Allow reply to whispers if you are under CONFIG_CHAT_WHISPER_LEVEL_REQ, and implement feature for GMs to remove single players from their WhisperWhiteList.
Remove documentation for script/custom texts

The related code and tables do not exist anymore.
Fix some engrish
Core/Unit: Fall after exiting vehicle if is in air and can not fly
Script/Quest: Into the wild green Yonder

Still todo:
* Fix spell focus requirement for the drop spell casted by the vehicle

Closes: #8752
Merge pull request #9396 from thomas007788/Whispers

Allow reply to whispers if you are under CONFIG_CHAT_WHISPER_LEVEL_REQ
SQL: Rename SQL file after PR merge
Core: Fix non pch build
Scripts/Commands: Fix "cannot pass objects of non-trivially-copyable type ‘std::string’ through ‘...’"
DB/Conditions: Fix some spell implicit targets

Fix an SAI issue (visual only)
Core/Grids: Fix possible crash
Update Whisper pr, missed some logic there
DB/Quests: Fix Valkyrion Must Burn, closes #2595

Replace core script with SAI
DB/Creature: Fix a creature state (visual only)
Merge pull request #9447 from thomas007788/WhisperV2

Update Whisper pr, missed some logic there
DB/Quests: Fix Send Them Packing, closes #6851
Scripts/Commands: Add .list mail $char/$guid command

Prints a list of mails received by the characters

Closs #9421
Core/DB: Fix a table name in CHAR_SEL_MAIL_LIST_INFO
Core: Fix warnings